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AHgh+RoQ1UZ7OVvCgt6Mahz75s8tQdAPhH4a278i92JtsfDX7D8XkRRUMIboDpFSltMbWwv8W6I=@vger.kernel.org X-Gm-Message-State: AFuF++mkKsxlgMC3v3x+j2QJjHrK8QXSmF12cz7I1yishdqtEv2/oedH IKb4gCJCkEEr42d0vyg2TrbW/tzAvHf2XMhdDa0K34Km9fX0ia5Znk+wbR/9vUF5Wi71h7zUXCw 9uBaGQU6FSRrr83rMz9F8C1w3ScgixRBX3WuddcPlXq7VTM5sRUvL3mGJyXc= Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:50a1:b0:4a4:ed9a:e793 with SMTP id 5614622812f47-4b366a66cf5mr7344592b6e.16.1787760828091; Wed, 26 Aug 2026 09:13:48 -0700 (PDT) Date: Wed, 26 Aug 2026 09:13:48 -0700 In-Reply-To: <20260826103615.932094-1-pulehui@huaweicloud.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a8f10bc.50659fcc.60cd.0002.GAE@google.com> Subject: [syzbot ci] Re: bpf: Fix UAF due to concurrent consumption of waiting_for_gp_ttrace From: syzbot ci To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, eddyz87@gmail.com, emil@etsalapatis.com, ihor.solodrai@linux.dev, jolsa@kernel.org, linux-kernel@vger.kernel.org, martin.lau@linux.dev, memxor@gmail.com, pulehui@huawei.com, pulehui@huaweicloud.com, song@kernel.org, yonghong.song@linux.dev Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v1] bpf: Fix UAF due to concurrent consumption of waiting_for_gp_ttrace https://lore.kernel.org/all/20260826103615.932094-1-pulehui@huaweicloud.com * [PATCH bpf] bpf: Fix UAF due to concurrent consumption of waiting_for_gp_ttrace and found the following issues: * BUG: unable to handle kernel NULL pointer dereference in rcu_core * BUG: unable to handle kernel paging request in corrupted * WARNING in mntput_no_expire_slowpath * kernel BUG in free_percpu Full report is available here: https://ci.syzbot.org/series/cfb01d47-3cc7-43a6-99e6-c4a0c6e6ce89 *** BUG: unable to handle kernel NULL pointer dereference in rcu_core tree: bpf URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf.git base: 75b0a6db4300e4c2c9e97a0848deaa7acfb42fb7 arch: amd64 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/187f4142-010e-469f-b2d4-8ce60c1dd2c5/config syz repro: https://ci.syzbot.org/findings/5ac25989-0260-4506-a08a-25fa6e4957e7/syz_repro BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 800000016a651067 P4D 800000016a651067 PUD 0 Oops: Oops: 0010 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 5776 Comm: syz.0.18 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0018:ffffc90000a08db8 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000028 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffe8ffffc2c5d0 RBP: ffffc90000a08f20 R08: ffffffff81ad5526 R09: 0000000000000000 R10: ffffc90000a08c70 R11: 0000000000000000 R12: ffffe8ffffc2c5d0 R13: dffffc0000000000 R14: ffffffff81ad5526 R15: ffffe8ffffc2c5d8 FS: 00005555813d0500(0000) GS:ffff8882a8f2d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 0000000105338000 CR4: 00000000000006f0 Call Trace: rcu_do_batch kernel/rcu/tree.c:2645 [inline] rcu_core+0x794/0x10b0 kernel/rcu/tree.c:2897 handle_softirqs+0x226/0x860 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:767 irq_exit_rcu+0x9/0x30 kernel/softirq.c:784 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:lock_release+0x2d7/0x3c0 kernel/locking/lockdep.c:5911 Code: a2 cc 11 00 00 00 00 eb b5 e8 55 12 34 0a f7 c3 00 02 00 00 74 b9 65 48 8b 05 ad 5d cc 11 48 3b 44 24 28 75 44 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 8a 17 37 0a cc 48 8d 3d b2 b3 b8 RSP: 0018:ffffc900039dfa68 EFLAGS: 00000282 RAX: 4b32b4bcbbad6400 RBX: 0000000000000287 RCX: 0000000000000046 RDX: 0000000000000000 RSI: ffffffff8e4d8901 RDI: ffffffff8c4cd780 RBP: ffff88810b5d29a8 R08: ffffffff821d972f R09: 0000000000000000 R10: 0000000000000000 R11: ffff8881162fe9b8 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8881162fe9b8 R15: ffff88810b5d1e00 _inline_copy_from_user include/linux/uaccess.h:169 [inline] _copy_from_user+0x28/0xb0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:222 [inline] generic_map_update_batch+0x668/0xae0 kernel/bpf/syscall.c:2101 bpf_map_do_batch+0x391/0x630 kernel/bpf/syscall.c:5781 __sys_bpf+0xbe5/0xd90 kernel/bpf/syscall.c:-1 __do_sys_bpf kernel/bpf/syscall.c:6486 [inline] __se_sys_bpf kernel/bpf/syscall.c:6483 [inline] __x64_sys_bpf+0xba/0xd0 kernel/bpf/syscall.c:6483 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7febdab9e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc5722f5a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007febdae25fa0 RCX: 00007febdab9e0d9 RDX: 0000000000000038 RSI: 00002000000003c0 RDI: 000000000000001a RBP: 00007febdac35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007febdae25fac R14: 00007febdae25fa0 R15: 00007febdae25fa0 Modules linked in: CR2: 0000000000000000 ---[ end trace 0000000000000000 ]--- RIP: 0010:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0018:ffffc90000a08db8 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000028 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffe8ffffc2c5d0 RBP: ffffc90000a08f20 R08: ffffffff81ad5526 R09: 0000000000000000 R10: ffffc90000a08c70 R11: 0000000000000000 R12: ffffe8ffffc2c5d0 R13: dffffc0000000000 R14: ffffffff81ad5526 R15: ffffe8ffffc2c5d8 FS: 00005555813d0500(0000) GS:ffff8882a8f2d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 0000000105338000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: a2 cc 11 00 00 00 00 movabs %al,0xb5eb0000000011cc 7: eb b5 9: e8 55 12 34 0a call 0xa341263 e: f7 c3 00 02 00 00 test $0x200,%ebx 14: 74 b9 je 0xffffffcf 16: 65 48 8b 05 ad 5d cc mov %gs:0x11cc5dad(%rip),%rax # 0x11cc5dcb 1d: 11 1e: 48 3b 44 24 28 cmp 0x28(%rsp),%rax 23: 75 44 jne 0x69 25: fb sti 26: 48 83 c4 30 add $0x30,%rsp * 2a: 5b pop %rbx <-- trapping instruction 2b: 41 5c pop %r12 2d: 41 5d pop %r13 2f: 41 5e pop %r14 31: 41 5f pop %r15 33: 5d pop %rbp 34: e9 8a 17 37 0a jmp 0xa3717c3 39: cc int3 3a: 48 rex.W 3b: 8d .byte 0x8d 3c: 3d .byte 0x3d 3d: b2 b3 mov $0xb3,%dl 3f: b8 .byte 0xb8 *** BUG: unable to handle kernel paging request in corrupted tree: bpf URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf.git base: 75b0a6db4300e4c2c9e97a0848deaa7acfb42fb7 arch: amd64 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/187f4142-010e-469f-b2d4-8ce60c1dd2c5/config syz repro: https://ci.syzbot.org/findings/d4bc6f3a-dacb-412b-ac9d-51a5c1dbc4a4/syz_repro kernel tried to execute NX-protected page - exploit attempt? (uid: 0) BUG: unable to handle page fault for address: ffff888173315c00 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0011) - permissions violation PGD 1acd0067 P4D 1acd0067 PUD 1acd5067 PMD 80000001732000e3 Oops: Oops: 0011 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:0xffff888173315c00 Code: ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <80> 5b 31 73 81 88 ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 RSP: 0018:ffffc90000007d60 EFLAGS: 00010246 RAX: 1ffffd1ffff8f783 RBX: ffffe8ffffc7bc18 RCX: ffffffff8e88ef80 RDX: 0000000000000100 RSI: ffff888174548380 RDI: ffffffff81f86ab8 RBP: ffffe8ffffc7bc10 R08: 0000000000000100 R09: 0000000000000000 R10: 0000000000000000 R11: ffff888173315c00 R12: e5894855fa1e0ff3 R13: ffff888173315c00 R14: ffffffff81f86ab0 R15: ffffe8ffffc7bc18 FS: 0000000000000000(0000) GS:ffff88818d92d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff888173315c00 CR3: 000000010b9a2000 CR4: 00000000000006f0 Call Trace: Modules linked in: CR2: ffff888173315c00 ---[ end trace 0000000000000000 ]--- RIP: 0010:0xffff888173315c00 Code: ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <80> 5b 31 73 81 88 ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 RSP: 0018:ffffc90000007d60 EFLAGS: 00010246 RAX: 1ffffd1ffff8f783 RBX: ffffe8ffffc7bc18 RCX: ffffffff8e88ef80 RDX: 0000000000000100 RSI: ffff888174548380 RDI: ffffffff81f86ab8 RBP: ffffe8ffffc7bc10 R08: 0000000000000100 R09: 0000000000000000 R10: 0000000000000000 R11: ffff888173315c00 R12: e5894855fa1e0ff3 R13: ffff888173315c00 R14: ffffffff81f86ab0 R15: ffffe8ffffc7bc18 FS: 0000000000000000(0000) GS:ffff88818d92d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff888173315c00 CR3: 000000010b9a2000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess), 2 bytes skipped: * 28: 80 5b 31 73 sbbb $0x73,0x31(%rbx) <-- trapping instruction 2c: 81 88 ff ff 00 00 00 orl $0x0,0xffff(%rax) 33: 00 00 00 *** WARNING in mntput_no_expire_slowpath tree: bpf URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf.git base: 75b0a6db4300e4c2c9e97a0848deaa7acfb42fb7 arch: amd64 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/187f4142-010e-469f-b2d4-8ce60c1dd2c5/config syz repro: https://ci.syzbot.org/findings/f322b4d1-7f66-454a-80ff-6ed13eb274aa/syz_repro ------------[ cut here ]------------ count < 0 WARNING: fs/namespace.c:1353 at mntput_no_expire_slowpath+0x845/0xbf0 fs/namespace.c:1353, CPU#1: syz.0.20/5861 Modules linked in: CPU: 1 UID: 0 PID: 5861 Comm: syz.0.20 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:mntput_no_expire_slowpath+0x845/0xbf0 fs/namespace.c:1353 Code: 01 00 00 00 bf 08 00 00 00 48 c7 c2 c0 48 ce 8e e8 a0 18 39 ff e9 47 fc ff ff e8 36 4e 72 ff e9 4a fa ff ff e8 2c 4e 72 ff 90 <0f> 0b 90 e9 68 fa ff ff e8 1e 4e 72 ff e8 69 83 fe ff e8 64 f7 ff RSP: 0018:ffffc90003cdfba0 EFLAGS: 00010293 RAX: ffffffff8254bf34 RBX: dffffc0000000000 RCX: ffff888113571e00 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000 RBP: ffffc90003cdfc88 R08: ffffffff8254cacc R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8e814988 R12: ffff8881016c3600 R13: 0000000000000003 R14: 00000000ffffffff R15: 0000000000000002 FS: 00007fa12e5946c0(0000) GS:ffff8882a8f2d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555579145a28 CR3: 0000000176282000 CR4: 00000000000006f0 Call Trace: mntput fs/namespace.c:1421 [inline] cleanup_mnt+0x30c/0x460 fs/namespace.c:1313 task_work_run+0x1d9/0x270 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x73a/0x2360 kernel/exit.c:1009 __do_sys_exit kernel/exit.c:1119 [inline] __se_sys_exit kernel/exit.c:1117 [inline] __x64_sys_exit+0x40/0x40 kernel/exit.c:1117 x64_sys_call+0x18b4/0x18d0 arch/x86/include/generated/asm/syscalls_64.h:61 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa12d79e0d9 Code: Unable to access opcode bytes at 0x7fa12d79e0af. RSP: 002b:00007fa12e593fd8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c RAX: ffffffffffffffda RBX: 00007fa12da25fa0 RCX: 00007fa12d79e0d9 RDX: 00007fa12e5949c8 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fa12d835024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa12da26038 R14: 00007fa12da25fa0 R15: 00007ffe0f572ca8 *** kernel BUG in free_percpu tree: bpf URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf.git base: 75b0a6db4300e4c2c9e97a0848deaa7acfb42fb7 arch: amd64 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/187f4142-010e-469f-b2d4-8ce60c1dd2c5/config syz repro: https://ci.syzbot.org/findings/40ff44c7-989e-4e59-a57c-7d669c0abd76/syz_repro ------------[ cut here ]------------ kernel BUG at mm/vmalloc.c:835! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 3326 Comm: kworker/u9:4 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Workqueue: events_unbound bpf_map_free_deferred RIP: 0010:vmalloc_to_page+0x67c/0x6b0 mm/vmalloc.c:835 Code: 51 fb ff ff e8 b5 a8 a2 ff 42 80 7c 2d 00 00 0f 85 5c fb ff ff e9 5f fb ff ff e8 9f a8 a2 ff e9 ae fb ff ff e8 95 a8 a2 ff 90 <0f> 0b e8 8d a8 a2 ff e9 64 fa ff ff e8 83 a8 a2 ff 48 b8 00 00 00 RSP: 0018:ffffc90000007cc0 EFLAGS: 00010246 RAX: ffffffff822464cb RBX: 5440ddc2e3d42741 RCX: ffff888110ad5a00 RDX: 0000000000000100 RSI: 0000000000000100 RDI: ffffc90000000000 RBP: ffffe8fee467b538 R08: 0000000000000100 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff81f86890 R12: 0000000000a881bb R13: dffffc0000000000 R14: ffffc90000000000 R15: ffffffff8e946000 FS: 0000000000000000(0000) GS:ffff88818d92d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000000 CR3: 000000001c4e4000 CR4: 00000000000006f0 Call Trace: pcpu_addr_to_page mm/percpu-vm.c:373 [inline] pcpu_chunk_addr_search mm/percpu.c:1612 [inline] free_percpu+0x1fa/0xfe0 mm/percpu.c:2246 free_one kernel/bpf/memalloc.c:262 [inline] free_all kernel/bpf/memalloc.c:275 [inline] __free_final_rcu+0x151/0x210 kernel/bpf/memalloc.c:287 rcu_do_batch kernel/rcu/tree.c:2645 [inline] rcu_core+0x794/0x10b0 kernel/rcu/tree.c:2897 handle_softirqs+0x226/0x860 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:767 irq_exit_rcu+0x9/0x30 kernel/softirq.c:784 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:lock_acquire+0x222/0x350 kernel/locking/lockdep.c:5890 Code: ff ff ff e8 f0 43 34 0a f7 44 24 08 00 02 00 00 0f 84 39 ff ff ff 65 48 8b 05 42 8f cc 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d d7 e1 b8 RSP: 0018:ffffc90006dc77e8 EFLAGS: 00000286 RAX: b973d41dfa964800 RBX: 0000000000000000 RCX: 8000000000000001 RDX: 00000000fa315d19 RSI: ffffffff8e4d8901 RDI: ffffffff8c4cd780 RBP: ffffffff823e19a8 R08: ffffffff823e19a8 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8eb5a1e0 R12: 0000000000000002 R13: ffffffff8eb5a1e0 R14: 0000000000000000 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:300 [inline] rcu_read_lock include/linux/rcupdate.h:840 [inline] get_non_dying_memcg_start mm/memcontrol.c:817 [inline] mod_memcg_state+0x64/0x190 mm/memcontrol.c:879 account_kmem_nmi_safe mm/memcontrol.c:3057 [inline] obj_cgroup_uncharge_pages mm/memcontrol.c:3073 [inline] __refill_obj_stock+0x559/0x6c0 mm/memcontrol.c:3459 __memcg_slab_free_hook+0x2bc/0x470 mm/memcontrol.c:3649 memcg_slab_free_hook mm/slub.c:2475 [inline] slab_free mm/slub.c:6374 [inline] kfree+0x3d6/0x640 mm/slub.c:6692 free_one kernel/bpf/memalloc.c:264 [inline] free_all kernel/bpf/memalloc.c:275 [inline] drain_mem_cache+0x643/0x8e0 kernel/bpf/memalloc.c:653 bpf_mem_alloc_destroy+0x142/0x550 kernel/bpf/memalloc.c:766 trie_free+0x134/0x160 kernel/bpf/lpm_trie.c:652 bpf_map_free+0x19d/0x3f0 kernel/bpf/syscall.c:896 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa88/0x14c0 kernel/workqueue.c:3405 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:vmalloc_to_page+0x67c/0x6b0 mm/vmalloc.c:835 Code: 51 fb ff ff e8 b5 a8 a2 ff 42 80 7c 2d 00 00 0f 85 5c fb ff ff e9 5f fb ff ff e8 9f a8 a2 ff e9 ae fb ff ff e8 95 a8 a2 ff 90 <0f> 0b e8 8d a8 a2 ff e9 64 fa ff ff e8 83 a8 a2 ff 48 b8 00 00 00 RSP: 0018:ffffc90000007cc0 EFLAGS: 00010246 RAX: ffffffff822464cb RBX: 5440ddc2e3d42741 RCX: ffff888110ad5a00 RDX: 0000000000000100 RSI: 0000000000000100 RDI: ffffc90000000000 RBP: ffffe8fee467b538 R08: 0000000000000100 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff81f86890 R12: 0000000000a881bb R13: dffffc0000000000 R14: ffffc90000000000 R15: ffffffff8e946000 FS: 0000000000000000(0000) GS:ffff88818d92d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000000 CR3: 000000000e946000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: e8 f0 43 34 0a call 0xa3443f5 5: f7 44 24 08 00 02 00 testl $0x200,0x8(%rsp) c: 00 d: 0f 84 39 ff ff ff je 0xffffff4c 13: 65 48 8b 05 42 8f cc mov %gs:0x11cc8f42(%rip),%rax # 0x11cc8f5d 1a: 11 1b: 48 3b 44 24 58 cmp 0x58(%rsp),%rax 20: 75 33 jne 0x55 22: fb sti 23: 48 83 c4 60 add $0x60,%rsp * 27: 5b pop %rbx <-- trapping instruction 28: 41 5c pop %r12 2a: 41 5d pop %r13 2c: 41 5e pop %r14 2e: 41 5f pop %r15 30: 5d pop %rbp 31: c3 ret 32: cc int3 33: cc int3 34: cc int3 35: cc int3 36: cc int3 37: 48 rex.W 38: 8d .byte 0x8d 39: 3d .byte 0x3d 3a: d7 xlat %ds:(%rbx) 3b: e1 b8 loope 0xfffffff5 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. To test a fix for this bug, please reply with `#syz test` (on a separate line) and attach the patch to the email. Notes: - The patch will be applied on top of the tested series (as an incremental fix). - To test a new version of the whole series, please send it directly to syzbot@lists.linux.dev. - Arguments like custom git repos and branches are not supported.