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Fri, 26 Jun 2026 14:28:32 -0700 (PDT) Message-ID: <6a3eef00.26dcea81.1cc135.d4fa@mx.google.com> Date: Fri, 26 Jun 2026 14:28:32 -0700 (PDT) Subject: general protection fault in detach_timer To: paulmck@kernel.org, andriy.shevchenko@linux.intel.com, simona.vetter@ffwll.ch, rdunlap@infradead.org, akpm@linux-foundation.org, luca.ceresoli@bootlin.com, linux-kernel@vger.kernel.org Cc: syzkaller@googlegroups.com, contact@pgazz.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: sanan.hasanou@gmail.com Good day, dear maintainers, We found a bug using a modified version of syzkaller. Kernel Branch: 7.0-rc1 Kernel Config: Unfortunately, we don't have any reproducer for this bug yet. Thank you! Best regards, Sanan Hasanov Oops: general protection fault, probably for non-canonical address 0xfbd59c0000000025: 0000 [#1] SMP KASAN KASAN: maybe wild-memory-access in range [0xdead000000000128-0xdead00000000012f] CPU: 1 UID: 0 PID: 9535 Comm: sshd Not tainted 7.0.0-rc1 #1 PREEMPT_{RT,(full)} Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:__hlist_del include/linux/list.h:994 [inline] RIP: 0010:detach_timer+0xfc/0x280 kernel/time/timer.c:891 Code: c1 e8 03 80 3c 18 00 74 08 4c 89 ef e8 0d 97 73 00 4d 89 65 00 4d 85 e4 74 45 e8 1f 1d 13 00 49 83 c4 08 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 e7 e8 e6 96 73 00 4d 89 2c 24 80 7d d4 00 RSP: 0018:ffffc90004fef2c8 EFLAGS: 00010012 RAX: 1bd5a00000000025 RBX: dffffc0000000000 RCX: ffff8880259c3980 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90004fef308 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1db00d7 R12: dead00000000012a R13: ffff88806b32eb70 R14: ffff88802d70dfd0 R15: 1ffff11005ae1bfa FS: 00007f6eaab35900(0000) GS:ffff8880dc1a8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1ab7106260 CR3: 0000000042f28000 CR4: 00000000000006f0 Call Trace: detach_if_pending kernel/time/timer.c:910 [inline] __mod_timer+0x782/0xeb0 kernel/time/timer.c:1097 mod_timer+0x28/0x30 kernel/time/timer.c:1195 sk_reset_timer+0x2b/0xc0 net/core/sock.c:3677 inet_csk_reset_xmit_timer include/net/inet_connection_sock.h:-1 [inline] tcp_reset_xmit_timer include/net/tcp.h:1575 [inline] tcp_rearm_rto+0x363/0x4d0 net/ipv4/tcp_input.c:3548 tcp_event_new_data_sent+0x337/0x540 net/ipv4/tcp_output.c:105 tcp_write_xmit+0x1d3c/0x6910 net/ipv4/tcp_output.c:3071 __tcp_push_pending_frames+0xa5/0x390 net/ipv4/tcp_output.c:3247 tcp_push+0x4a0/0x670 net/ipv4/tcp.c:782 tcp_sendmsg_locked+0x4b3f/0x57e0 net/ipv4/tcp.c:1427 tcp_sendmsg+0x38/0x50 net/ipv4/tcp.c:1464 inet_sendmsg+0x199/0x310 net/ipv4/af_inet.c:859 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] sock_write_iter+0x304/0x460 net/socket.c:1195 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x5ed/0xb50 fs/read_write.c:688 ksys_write+0x14e/0x250 fs/read_write.c:740 __do_sys_write fs/read_write.c:751 [inline] __se_sys_write fs/read_write.c:748 [inline] __x64_sys_write+0x84/0x90 fs/read_write.c:748 x64_sys_call+0x23cf/0x2900 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x11c/0x810 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x7f6eab014473 Code: 8b 15 21 2a 0e 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 55 c3 0f 1f 40 00 48 83 ec 28 48 89 54 24 18 RSP: 002b:00007ffec7930fa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00000000000016b4 RCX: 00007f6eab014473 RDX: 00000000000016b4 RSI: 000055a34821fcd0 RDI: 0000000000000004 RBP: 000055a3481f6d10 R08: 3fffffffffffffff R09: 4000000000000000 R10: 7fffffffffffffff R11: 0000000000000246 R12: 000055a323c98768 R13: 0000000000000000 R14: 0000000000000004 R15: 000055a323c4da80 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__hlist_del include/linux/list.h:994 [inline] RIP: 0010:detach_timer+0xfc/0x280 kernel/time/timer.c:891 Code: c1 e8 03 80 3c 18 00 74 08 4c 89 ef e8 0d 97 73 00 4d 89 65 00 4d 85 e4 74 45 e8 1f 1d 13 00 49 83 c4 08 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 e7 e8 e6 96 73 00 4d 89 2c 24 80 7d d4 00 RSP: 0018:ffffc90004fef2c8 EFLAGS: 00010012 RAX: 1bd5a00000000025 RBX: dffffc0000000000 RCX: ffff8880259c3980 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90004fef308 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1db00d7 R12: dead00000000012a R13: ffff88806b32eb70 R14: ffff88802d70dfd0 R15: 1ffff11005ae1bfa FS: 00007f6eaab35900(0000) GS:ffff8880dc1a8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1ab7106260 CR3: 0000000042f28000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: c1 e8 03 shr $0x3,%eax 3: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) 7: 74 08 je 0x11 9: 4c 89 ef mov %r13,%rdi c: e8 0d 97 73 00 call 0x73971e 11: 4d 89 65 00 mov %r12,0x0(%r13) 15: 4d 85 e4 test %r12,%r12 18: 74 45 je 0x5f 1a: e8 1f 1d 13 00 call 0x131d3e 1f: 49 83 c4 08 add $0x8,%r12 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 e7 mov %r12,%rdi 33: e8 e6 96 73 00 call 0x73971e 38: 4d 89 2c 24 mov %r13,(%r12) 3c: 80 7d d4 00 cmpb $0x0,-0x2c(%rbp) <<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>>