* [syzbot] [trace?] general protection fault in mtree_load @ 2026-06-22 6:59 syzbot 2026-06-22 13:04 ` Oleg Nesterov 2026-07-01 1:32 ` syzbot 0 siblings, 2 replies; 6+ messages in thread From: syzbot @ 2026-06-22 6:59 UTC (permalink / raw) To: bp, dave.hansen, hpa, linux-kernel, linux-trace-kernel, mhiramat, mingo, oleg, peterz, syzkaller-bugs, tglx, x86 Hello, syzbot found the following issue on: HEAD commit: 6b5a2b7d9bc1 Merge tag 'trace-tools-v7.2' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16d56986580000 kernel config: https://syzkaller.appspot.com/x/.config?x=ea6584355d75e0cd dashboard link: https://syzkaller.appspot.com/bug?extid=61ce80689253f42e6d80 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-6b5a2b7d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b3cb0499fbe9/vmlinux-6b5a2b7d.xz kernel image: https://storage.googleapis.com/syzbot-assets/47cfbe57f6ea/bzImage-6b5a2b7d.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+61ce80689253f42e6d80@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000011: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000088-0x000000000000008f] CPU: 3 UID: 0 PID: 24402 Comm: syz.4.5217 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:mas_root lib/maple_tree.c:759 [inline] RIP: 0010:mas_start lib/maple_tree.c:1179 [inline] RIP: 0010:mtree_load+0x16d/0xa90 lib/maple_tree.c:5657 Code: 00 00 00 00 48 c7 44 24 78 ff ff ff ff e8 6b bd 84 f6 48 8b 5c 24 50 c6 84 24 9c 00 00 00 00 48 8d 7b 48 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 d6 08 00 00 48 8b 5b 48 e8 6f 1a 08 00 31 ff RSP: 0018:ffffc900039c76d8 EFLAGS: 00010206 RAX: 0000000000000011 RBX: 0000000000000040 RCX: ffffffff8b848746 RDX: ffff888041b6a540 RSI: ffffffff8b848775 RDI: 0000000000000088 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000001 R11: 000000000000751b R12: dffffc0000000000 R13: ffff88802693adc0 R14: 00001fff904365a7 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880d665f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f44aa04f156 CR3: 00000000364d5000 CR4: 0000000000352ef0 Call Trace: <TASK> vma_lookup include/linux/mm.h:4204 [inline] __in_uprobe_trampoline arch/x86/kernel/uprobes.c:766 [inline] __is_optimized arch/x86/kernel/uprobes.c:1056 [inline] is_optimized arch/x86/kernel/uprobes.c:1067 [inline] set_orig_insn+0x1ec/0x2a0 arch/x86/kernel/uprobes.c:1098 remove_breakpoint kernel/events/uprobes.c:1185 [inline] register_for_each_vma+0xbb7/0xdb0 kernel/events/uprobes.c:1318 uprobe_unregister_nosync+0x12a/0x1c0 kernel/events/uprobes.c:1343 bpf_uprobe_unregister kernel/trace/bpf_trace.c:2936 [inline] bpf_uprobe_multi_link_release+0xb3/0x1c0 kernel/trace/bpf_trace.c:2947 bpf_link_free+0xec/0x4a0 kernel/bpf/syscall.c:3273 bpf_link_put_direct kernel/bpf/syscall.c:3326 [inline] bpf_link_release+0x5d/0x80 kernel/bpf/syscall.c:3333 __fput+0x3ff/0xb50 fs/file_table.c:512 task_work_run+0x150/0x240 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x951/0x2ae0 kernel/exit.c:1004 do_group_exit+0xd5/0x2a0 kernel/exit.c:1147 get_signal+0x1ec7/0x21e0 kernel/signal.c:3038 arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop+0x139/0x6f0 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] ret_from_fork+0x932/0xd50 arch/x86/kernel/process.c:167 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:mas_root lib/maple_tree.c:759 [inline] RIP: 0010:mas_start lib/maple_tree.c:1179 [inline] RIP: 0010:mtree_load+0x16d/0xa90 lib/maple_tree.c:5657 Code: 00 00 00 00 48 c7 44 24 78 ff ff ff ff e8 6b bd 84 f6 48 8b 5c 24 50 c6 84 24 9c 00 00 00 00 48 8d 7b 48 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 d6 08 00 00 48 8b 5b 48 e8 6f 1a 08 00 31 ff RSP: 0018:ffffc900039c76d8 EFLAGS: 00010206 RAX: 0000000000000011 RBX: 0000000000000040 RCX: ffffffff8b848746 RDX: ffff888041b6a540 RSI: ffffffff8b848775 RDI: 0000000000000088 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000001 R11: 000000000000751b R12: dffffc0000000000 R13: ffff88802693adc0 R14: 00001fff904365a7 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880d665f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c433cbf CR3: 00000000429b6000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 00 add %al,(%rax) 4: 48 c7 44 24 78 ff ff movq $0xffffffffffffffff,0x78(%rsp) b: ff ff d: e8 6b bd 84 f6 call 0xf684bd7d 12: 48 8b 5c 24 50 mov 0x50(%rsp),%rbx 17: c6 84 24 9c 00 00 00 movb $0x0,0x9c(%rsp) 1e: 00 1f: 48 8d 7b 48 lea 0x48(%rbx),%rdi 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 0f 85 d6 08 00 00 jne 0x90b 35: 48 8b 5b 48 mov 0x48(%rbx),%rbx 39: e8 6f 1a 08 00 call 0x81aad 3e: 31 ff xor %edi,%edi --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [syzbot] [trace?] general protection fault in mtree_load 2026-06-22 6:59 [syzbot] [trace?] general protection fault in mtree_load syzbot @ 2026-06-22 13:04 ` Oleg Nesterov 2026-06-24 7:49 ` Jiri Olsa 2026-07-01 1:32 ` syzbot 1 sibling, 1 reply; 6+ messages in thread From: Oleg Nesterov @ 2026-06-22 13:04 UTC (permalink / raw) To: syzbot Cc: bp, dave.hansen, hpa, linux-kernel, linux-trace-kernel, mhiramat, mingo, peterz, syzkaller-bugs, tglx, x86 On 06/21, syzbot wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 6b5a2b7d9bc1 Merge tag 'trace-tools-v7.2' of git://git.ker.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=16d56986580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=ea6584355d75e0cd > dashboard link: https://syzkaller.appspot.com/bug?extid=61ce80689253f42e6d80 > compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-6b5a2b7d.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/b3cb0499fbe9/vmlinux-6b5a2b7d.xz > kernel image: https://storage.googleapis.com/syzbot-assets/47cfbe57f6ea/bzImage-6b5a2b7d.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+61ce80689253f42e6d80@syzkaller.appspotmail.com > > Oops: general protection fault, probably for non-canonical address 0xdffffc0000000011: 0000 [#1] SMP KASAN NOPTI > KASAN: null-ptr-deref in range [0x0000000000000088-0x000000000000008f] > CPU: 3 UID: 0 PID: 24402 Comm: syz.4.5217 Tainted: G L syzkaller #0 PREEMPT(full) > Tainted: [L]=SOFTLOCKUP > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 > RIP: 0010:mas_root lib/maple_tree.c:759 [inline] > RIP: 0010:mas_start lib/maple_tree.c:1179 [inline] > RIP: 0010:mtree_load+0x16d/0xa90 lib/maple_tree.c:5657 > Code: 00 00 00 00 48 c7 44 24 78 ff ff ff ff e8 6b bd 84 f6 48 8b 5c 24 50 c6 84 24 9c 00 00 00 00 48 8d 7b 48 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 d6 08 00 00 48 8b 5b 48 e8 6f 1a 08 00 31 ff > RSP: 0018:ffffc900039c76d8 EFLAGS: 00010206 > RAX: 0000000000000011 RBX: 0000000000000040 RCX: ffffffff8b848746 > RDX: ffff888041b6a540 RSI: ffffffff8b848775 RDI: 0000000000000088 > RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000001 > R10: 0000000000000001 R11: 000000000000751b R12: dffffc0000000000 > R13: ffff88802693adc0 R14: 00001fff904365a7 R15: dffffc0000000000 > FS: 0000000000000000(0000) GS:ffff8880d665f000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f44aa04f156 CR3: 00000000364d5000 CR4: 0000000000352ef0 > Call Trace: > <TASK> > vma_lookup include/linux/mm.h:4204 [inline] > __in_uprobe_trampoline arch/x86/kernel/uprobes.c:766 [inline] > __is_optimized arch/x86/kernel/uprobes.c:1056 [inline] > is_optimized arch/x86/kernel/uprobes.c:1067 [inline] > set_orig_insn+0x1ec/0x2a0 arch/x86/kernel/uprobes.c:1098 > remove_breakpoint kernel/events/uprobes.c:1185 [inline] > register_for_each_vma+0xbb7/0xdb0 kernel/events/uprobes.c:1318 > uprobe_unregister_nosync+0x12a/0x1c0 kernel/events/uprobes.c:1343 > bpf_uprobe_unregister kernel/trace/bpf_trace.c:2936 [inline] > bpf_uprobe_multi_link_release+0xb3/0x1c0 kernel/trace/bpf_trace.c:2947 > bpf_link_free+0xec/0x4a0 kernel/bpf/syscall.c:3273 > bpf_link_put_direct kernel/bpf/syscall.c:3326 [inline] > bpf_link_release+0x5d/0x80 kernel/bpf/syscall.c:3333 > __fput+0x3ff/0xb50 fs/file_table.c:512 > task_work_run+0x150/0x240 kernel/task_work.c:233 > exit_task_work include/linux/task_work.h:40 [inline] current->mm is already NULL, the exiting task has already passed exit_mm(). Hopefully [PATCHv4 01/13] uprobes/x86: Use proper mm_struct in __in_uprobe_trampoline https://lore.kernel.org/all/20260526205840.173790-2-jolsa@kernel.org/ should help... Oleg. ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [syzbot] [trace?] general protection fault in mtree_load 2026-06-22 13:04 ` Oleg Nesterov @ 2026-06-24 7:49 ` Jiri Olsa 0 siblings, 0 replies; 6+ messages in thread From: Jiri Olsa @ 2026-06-24 7:49 UTC (permalink / raw) To: Oleg Nesterov Cc: syzbot, bp, dave.hansen, hpa, linux-kernel, linux-trace-kernel, mhiramat, mingo, peterz, syzkaller-bugs, tglx, x86 On Mon, Jun 22, 2026 at 03:04:16PM +0200, Oleg Nesterov wrote: > On 06/21, syzbot wrote: > > > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: 6b5a2b7d9bc1 Merge tag 'trace-tools-v7.2' of git://git.ker.. > > git tree: upstream > > console output: https://syzkaller.appspot.com/x/log.txt?x=16d56986580000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=ea6584355d75e0cd > > dashboard link: https://syzkaller.appspot.com/bug?extid=61ce80689253f42e6d80 > > compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 > > > > Unfortunately, I don't have any reproducer for this issue yet. > > > > Downloadable assets: > > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-6b5a2b7d.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/b3cb0499fbe9/vmlinux-6b5a2b7d.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/47cfbe57f6ea/bzImage-6b5a2b7d.xz > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+61ce80689253f42e6d80@syzkaller.appspotmail.com > > > > Oops: general protection fault, probably for non-canonical address 0xdffffc0000000011: 0000 [#1] SMP KASAN NOPTI > > KASAN: null-ptr-deref in range [0x0000000000000088-0x000000000000008f] > > CPU: 3 UID: 0 PID: 24402 Comm: syz.4.5217 Tainted: G L syzkaller #0 PREEMPT(full) > > Tainted: [L]=SOFTLOCKUP > > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 > > RIP: 0010:mas_root lib/maple_tree.c:759 [inline] > > RIP: 0010:mas_start lib/maple_tree.c:1179 [inline] > > RIP: 0010:mtree_load+0x16d/0xa90 lib/maple_tree.c:5657 > > Code: 00 00 00 00 48 c7 44 24 78 ff ff ff ff e8 6b bd 84 f6 48 8b 5c 24 50 c6 84 24 9c 00 00 00 00 48 8d 7b 48 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 d6 08 00 00 48 8b 5b 48 e8 6f 1a 08 00 31 ff > > RSP: 0018:ffffc900039c76d8 EFLAGS: 00010206 > > RAX: 0000000000000011 RBX: 0000000000000040 RCX: ffffffff8b848746 > > RDX: ffff888041b6a540 RSI: ffffffff8b848775 RDI: 0000000000000088 > > RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000001 > > R10: 0000000000000001 R11: 000000000000751b R12: dffffc0000000000 > > R13: ffff88802693adc0 R14: 00001fff904365a7 R15: dffffc0000000000 > > FS: 0000000000000000(0000) GS:ffff8880d665f000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 00007f44aa04f156 CR3: 00000000364d5000 CR4: 0000000000352ef0 > > Call Trace: > > <TASK> > > vma_lookup include/linux/mm.h:4204 [inline] > > __in_uprobe_trampoline arch/x86/kernel/uprobes.c:766 [inline] > > __is_optimized arch/x86/kernel/uprobes.c:1056 [inline] > > is_optimized arch/x86/kernel/uprobes.c:1067 [inline] > > set_orig_insn+0x1ec/0x2a0 arch/x86/kernel/uprobes.c:1098 > > remove_breakpoint kernel/events/uprobes.c:1185 [inline] > > register_for_each_vma+0xbb7/0xdb0 kernel/events/uprobes.c:1318 > > uprobe_unregister_nosync+0x12a/0x1c0 kernel/events/uprobes.c:1343 > > bpf_uprobe_unregister kernel/trace/bpf_trace.c:2936 [inline] > > bpf_uprobe_multi_link_release+0xb3/0x1c0 kernel/trace/bpf_trace.c:2947 > > bpf_link_free+0xec/0x4a0 kernel/bpf/syscall.c:3273 > > bpf_link_put_direct kernel/bpf/syscall.c:3326 [inline] > > bpf_link_release+0x5d/0x80 kernel/bpf/syscall.c:3333 > > __fput+0x3ff/0xb50 fs/file_table.c:512 > > task_work_run+0x150/0x240 kernel/task_work.c:233 > > exit_task_work include/linux/task_work.h:40 [inline] > > current->mm is already NULL, the exiting task has already passed exit_mm(). > > Hopefully > > [PATCHv4 01/13] uprobes/x86: Use proper mm_struct in __in_uprobe_trampoline > https://lore.kernel.org/all/20260526205840.173790-2-jolsa@kernel.org/ > > should help... yes, that sould fix it thanks, jirka ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [syzbot] [trace?] general protection fault in mtree_load 2026-06-22 6:59 [syzbot] [trace?] general protection fault in mtree_load syzbot 2026-06-22 13:04 ` Oleg Nesterov @ 2026-07-01 1:32 ` syzbot 2026-07-01 9:09 ` Oleg Nesterov 1 sibling, 1 reply; 6+ messages in thread From: syzbot @ 2026-07-01 1:32 UTC (permalink / raw) To: bp, dave.hansen, hpa, linux-kernel, linux-trace-kernel, mhiramat, mingo, oleg, olsajiri, peterz, syzkaller-bugs, tglx, x86 syzbot has found a reproducer for the following issue on: HEAD commit: dc59e4fea9d8 Linux 7.2-rc1 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15c7d61c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f9bf5d2bfae96234 dashboard link: https://syzkaller.appspot.com/bug?extid=61ce80689253f42e6d80 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12bbb11c580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=130bf4ea580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-dc59e4fe.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1bc8aed8d2e8/vmlinux-dc59e4fe.xz kernel image: https://storage.googleapis.com/syzbot-assets/0b1fdfc4aa09/bzImage-dc59e4fe.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+61ce80689253f42e6d80@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000011: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000088-0x000000000000008f] CPU: 3 UID: 0 PID: 6107 Comm: syz.0.85 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:mas_root lib/maple_tree.c:759 [inline] RIP: 0010:mas_start lib/maple_tree.c:1179 [inline] RIP: 0010:mtree_load+0x16d/0xa90 lib/maple_tree.c:5657 Code: 00 00 00 00 48 c7 44 24 78 ff ff ff ff e8 5b c8 74 f6 48 8b 5c 24 50 c6 84 24 9c 00 00 00 00 48 8d 7b 48 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 d6 08 00 00 48 8b 5b 48 e8 3f 1a 08 00 31 ff RSP: 0018:ffffc9000412f740 EFLAGS: 00010206 RAX: 0000000000000011 RBX: 0000000000000040 RCX: ffffffff8b94b796 RDX: ffff888035462540 RSI: ffffffff8b94b7c5 RDI: 0000000000000088 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff888013522280 R14: 0000200000ffc007 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880d63e0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc8aaa4cff8 CR3: 0000000038832000 CR4: 0000000000352ef0 Call Trace: <TASK> vma_lookup include/linux/mm.h:4238 [inline] __in_uprobe_trampoline arch/x86/kernel/uprobes.c:766 [inline] __is_optimized arch/x86/kernel/uprobes.c:1056 [inline] is_optimized arch/x86/kernel/uprobes.c:1067 [inline] set_orig_insn+0x1ec/0x2a0 arch/x86/kernel/uprobes.c:1098 remove_breakpoint kernel/events/uprobes.c:1185 [inline] register_for_each_vma+0xbb7/0xdb0 kernel/events/uprobes.c:1318 uprobe_unregister_nosync+0x12a/0x1c0 kernel/events/uprobes.c:1343 bpf_uprobe_unregister kernel/trace/bpf_trace.c:2982 [inline] bpf_uprobe_multi_link_release+0xb3/0x1c0 kernel/trace/bpf_trace.c:2993 bpf_link_free+0xec/0x4a0 kernel/bpf/syscall.c:3395 bpf_link_put_direct kernel/bpf/syscall.c:3448 [inline] bpf_link_release+0x5d/0x80 kernel/bpf/syscall.c:3455 __fput+0x3ff/0xb50 fs/file_table.c:512 task_work_run+0x150/0x240 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x951/0x2ae0 kernel/exit.c:1004 do_group_exit+0xd5/0x2a0 kernel/exit.c:1147 get_signal+0x1ec7/0x21e0 kernel/signal.c:3038 arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop+0x139/0x6f0 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] do_syscall_64+0x666/0x870 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc8a9b9de59 Code: Unable to access opcode bytes at 0x7fc8a9b9de2f. RSP: 002b:00007fc8aaa4d0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007fc8a9e25fa8 RCX: 00007fc8a9b9de59 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fc8a9e25fa8 RBP: 00007fc8a9e25fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc8a9e26038 R14: 00007fff99db45c0 R15: 00007fff99db46a8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:mas_root lib/maple_tree.c:759 [inline] RIP: 0010:mas_start lib/maple_tree.c:1179 [inline] RIP: 0010:mtree_load+0x16d/0xa90 lib/maple_tree.c:5657 Code: 00 00 00 00 48 c7 44 24 78 ff ff ff ff e8 5b c8 74 f6 48 8b 5c 24 50 c6 84 24 9c 00 00 00 00 48 8d 7b 48 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 d6 08 00 00 48 8b 5b 48 e8 3f 1a 08 00 31 ff RSP: 0018:ffffc9000412f740 EFLAGS: 00010206 RAX: 0000000000000011 RBX: 0000000000000040 RCX: ffffffff8b94b796 RDX: ffff888035462540 RSI: ffffffff8b94b7c5 RDI: 0000000000000088 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff888013522280 R14: 0000200000ffc007 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880d63e0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc8aaa4cff8 CR3: 0000000038832000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 00 add %al,(%rax) 4: 48 c7 44 24 78 ff ff movq $0xffffffffffffffff,0x78(%rsp) b: ff ff d: e8 5b c8 74 f6 call 0xf674c86d 12: 48 8b 5c 24 50 mov 0x50(%rsp),%rbx 17: c6 84 24 9c 00 00 00 movb $0x0,0x9c(%rsp) 1e: 00 1f: 48 8d 7b 48 lea 0x48(%rbx),%rdi 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 0f 85 d6 08 00 00 jne 0x90b 35: 48 8b 5b 48 mov 0x48(%rbx),%rbx 39: e8 3f 1a 08 00 call 0x81a7d 3e: 31 ff xor %edi,%edi --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [syzbot] [trace?] general protection fault in mtree_load 2026-07-01 1:32 ` syzbot @ 2026-07-01 9:09 ` Oleg Nesterov 2026-07-01 9:42 ` syzbot 0 siblings, 1 reply; 6+ messages in thread From: Oleg Nesterov @ 2026-07-01 9:09 UTC (permalink / raw) To: syzbot Cc: bp, dave.hansen, hpa, linux-kernel, linux-trace-kernel, mhiramat, mingo, olsajiri, peterz, syzkaller-bugs, tglx, x86 On 06/30, syzbot wrote: > > syzbot has found a reproducer for the following issue on: > > HEAD commit: dc59e4fea9d8 Linux 7.2-rc1 > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=15c7d61c580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=f9bf5d2bfae96234 > dashboard link: https://syzkaller.appspot.com/bug?extid=61ce80689253f42e6d80 > compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12bbb11c580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=130bf4ea580000 > > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-dc59e4fe.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/1bc8aed8d2e8/vmlinux-dc59e4fe.xz > kernel image: https://storage.googleapis.com/syzbot-assets/0b1fdfc4aa09/bzImage-dc59e4fe.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+61ce80689253f42e6d80@syzkaller.appspotmail.com > > Oops: general protection fault, probably for non-canonical address 0xdffffc0000000011: 0000 [#1] SMP KASAN NOPTI #syz test From: Jiri Olsa <jolsa@kernel.org> In the unregister path we use __in_uprobe_trampoline check with current->mm for the VMA lookup, which is wrong, because we are in the tracer context, not the traced process. Add mm_struct pointer argument to __in_uprobe_trampoline and changing related callers to pass proper mm_struct pointer. Fixes: ba2bfc97b462 ("uprobes/x86: Add support to optimize uprobes") Acked-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Jiri Olsa <jolsa@kernel.org> --- arch/x86/kernel/uprobes.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/arch/x86/kernel/uprobes.c b/arch/x86/kernel/uprobes.c index ebb1baf1eb1d..2be6707e3320 100644 --- a/arch/x86/kernel/uprobes.c +++ b/arch/x86/kernel/uprobes.c @@ -761,9 +761,9 @@ void arch_uprobe_clear_state(struct mm_struct *mm) destroy_uprobe_trampoline(tramp); } -static bool __in_uprobe_trampoline(unsigned long ip) +static bool __in_uprobe_trampoline(struct mm_struct *mm, unsigned long ip) { - struct vm_area_struct *vma = vma_lookup(current->mm, ip); + struct vm_area_struct *vma = vma_lookup(mm, ip); return vma && vma_is_special_mapping(vma, &tramp_mapping); } @@ -776,14 +776,14 @@ static bool in_uprobe_trampoline(unsigned long ip) rcu_read_lock(); if (mmap_lock_speculate_try_begin(mm, &seq)) { - found = __in_uprobe_trampoline(ip); + found = __in_uprobe_trampoline(mm, ip); retry = mmap_lock_speculate_retry(mm, seq); } rcu_read_unlock(); if (retry) { mmap_read_lock(mm); - found = __in_uprobe_trampoline(ip); + found = __in_uprobe_trampoline(mm, ip); mmap_read_unlock(mm); } return found; @@ -1044,7 +1044,7 @@ static int copy_from_vaddr(struct mm_struct *mm, unsigned long vaddr, void *dst, return 0; } -static bool __is_optimized(uprobe_opcode_t *insn, unsigned long vaddr) +static bool __is_optimized(struct mm_struct *mm, uprobe_opcode_t *insn, unsigned long vaddr) { struct __packed __arch_relative_insn { u8 op; @@ -1053,7 +1053,7 @@ static bool __is_optimized(uprobe_opcode_t *insn, unsigned long vaddr) if (!is_call_insn(insn)) return false; - return __in_uprobe_trampoline(vaddr + 5 + call->raddr); + return __in_uprobe_trampoline(mm, vaddr + 5 + call->raddr); } static int is_optimized(struct mm_struct *mm, unsigned long vaddr) @@ -1064,7 +1064,7 @@ static int is_optimized(struct mm_struct *mm, unsigned long vaddr) err = copy_from_vaddr(mm, vaddr, &insn, 5); if (err) return err; - return __is_optimized((uprobe_opcode_t *)&insn, vaddr); + return __is_optimized(mm, (uprobe_opcode_t *)&insn, vaddr); } static bool should_optimize(struct arch_uprobe *auprobe) -- 2.54.0 ^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [syzbot] [trace?] general protection fault in mtree_load 2026-07-01 9:09 ` Oleg Nesterov @ 2026-07-01 9:42 ` syzbot 0 siblings, 0 replies; 6+ messages in thread From: syzbot @ 2026-07-01 9:42 UTC (permalink / raw) To: bp, dave.hansen, hpa, linux-kernel, linux-trace-kernel, mhiramat, mingo, oleg, olsajiri, peterz, syzkaller-bugs, tglx, x86 Hello, syzbot has tested the proposed patch and the reproducer did not trigger any issue: Reported-by: syzbot+61ce80689253f42e6d80@syzkaller.appspotmail.com Tested-by: syzbot+61ce80689253f42e6d80@syzkaller.appspotmail.com Tested on: commit: 665159e2 Merge tag 'probes-fixes-v7.2-rc1' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14f7b11c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f9bf5d2bfae96234 dashboard link: https://syzkaller.appspot.com/bug?extid=61ce80689253f42e6d80 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 patch: https://syzkaller.appspot.com/x/patch.diff?x=1084b9fa580000 Note: testing is done by a robot and is best-effort only. ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2026-07-01 9:42 UTC | newest] Thread overview: 6+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2026-06-22 6:59 [syzbot] [trace?] general protection fault in mtree_load syzbot 2026-06-22 13:04 ` Oleg Nesterov 2026-06-24 7:49 ` Jiri Olsa 2026-07-01 1:32 ` syzbot 2026-07-01 9:09 ` Oleg Nesterov 2026-07-01 9:42 ` syzbot
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox