syzbot has found a reproducer for the following issue on: HEAD commit: 06afb0f36106 Merge tag 'trace-v6.13' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16017b78580000 kernel config: https://syzkaller.appspot.com/x/.config?x=95b76860fd16c857 dashboard link: https://syzkaller.appspot.com/bug?extid=6ac735cc9f9ce6ec2f74 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1098b6e8580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/112cedff0255/disk-06afb0f3.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f65020d28328/vmlinux-06afb0f3.xz kernel image: https://storage.googleapis.com/syzbot-assets/4fb4cb7df5b1/bzImage-06afb0f3.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6ac735cc9f9ce6ec2f74@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(1) WARNING: CPU: 1 PID: 19 at kernel/locking/lockdep.c:232 hlock_class kernel/locking/lockdep.c:232 [inline] WARNING: CPU: 1 PID: 19 at kernel/locking/lockdep.c:232 check_wait_context kernel/locking/lockdep.c:4850 [inline] WARNING: CPU: 1 PID: 19 at kernel/locking/lockdep.c:232 __lock_acquire+0x564/0x2100 kernel/locking/lockdep.c:5176 Modules linked in: CPU: 1 UID: 0 PID: 19 Comm: rcu_exp_gp_kthr Not tainted 6.12.0-syzkaller-07834-g06afb0f36106 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:hlock_class kernel/locking/lockdep.c:232 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4850 [inline] RIP: 0010:__lock_acquire+0x564/0x2100 kernel/locking/lockdep.c:5176 Code: 00 00 83 3d 11 c9 ac 0e 00 75 23 90 48 c7 c7 80 d1 0a 8c 48 c7 c6 80 d4 0a 8c e8 77 64 e5 ff 48 ba 00 00 00 00 00 fc ff df 90 <0f> 0b 90 90 90 31 db 48 81 c3 c4 00 00 00 48 89 d8 48 c1 e8 03 0f RSP: 0018:ffffc90000a18930 EFLAGS: 00010046 RAX: 9a7c2efbb9bd3e00 RBX: 00000000000010d8 RCX: ffff88801ced3c00 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00000000000c50d8 R08: ffffffff8155fe42 R09: 1ffff110170e519a R10: dffffc0000000000 R11: ffffed10170e519b R12: ffff88801ced46c4 R13: 0000000000000005 R14: 1ffff110039da8e5 R15: ffff88801ced4728 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055557b35c588 CR3: 0000000025380000 CR4: 0000000000350ef0 Call Trace: <IRQ> lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:606 raw_spin_rq_lock kernel/sched/sched.h:1514 [inline] rq_lock kernel/sched/sched.h:1813 [inline] ttwu_queue kernel/sched/core.c:3991 [inline] try_to_wake_up+0x7e2/0x1470 kernel/sched/core.c:4321 hrtimer_wakeup+0x62/0x80 kernel/time/hrtimer.c:1975 __run_hrtimer kernel/time/hrtimer.c:1739 [inline] __hrtimer_run_queues+0x59d/0xd50 kernel/time/hrtimer.c:1803 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1865 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x112/0x420 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:finish_task_switch+0x1ea/0x870 kernel/sched/core.c:5243 Code: c9 50 e8 79 07 0c 00 48 83 c4 08 4c 89 f7 e8 9d 39 00 00 e9 de 04 00 00 4c 89 f7 e8 50 26 6c 0a e8 6b 91 38 00 fb 48 8b 5d c0 <48> 8d bb f8 15 00 00 48 89 f8 48 c1 e8 03 49 be 00 00 00 00 00 fc RSP: 0018:ffffc900001878e8 EFLAGS: 00000282 RAX: 9a7c2efbb9bd3e00 RBX: ffff88801ced3c00 RCX: ffffffff9a3ec903 RDX: dffffc0000000000 RSI: ffffffff8c0ad2e0 RDI: ffffffff8c6072a0 RBP: ffffc90000187930 R08: ffffffff901d2db7 R09: 1ffffffff203a5b6 R10: dffffc0000000000 R11: fffffbfff203a5b7 R12: 1ffff110170e7e9c R13: dffffc0000000000 R14: ffff8880b863e6c0 R15: ffff8880b873f4e0 context_switch kernel/sched/core.c:5372 [inline] __schedule+0x1858/0x4c30 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6848 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99 synchronize_rcu_expedited_wait_once kernel/rcu/tree_exp.h:536 [inline] synchronize_rcu_expedited_wait kernel/rcu/tree_exp.h:649 [inline] rcu_exp_wait_wake kernel/rcu/tree_exp.h:678 [inline] rcu_exp_sel_wait_wake+0x77e/0x1dc0 kernel/rcu/tree_exp.h:712 kthread_worker_fn+0x502/0xb70 kernel/kthread.c:844 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> ---------------- Code disassembly (best guess): 0: c9 leave 1: 50 push %rax 2: e8 79 07 0c 00 call 0xc0780 7: 48 83 c4 08 add $0x8,%rsp b: 4c 89 f7 mov %r14,%rdi e: e8 9d 39 00 00 call 0x39b0 13: e9 de 04 00 00 jmp 0x4f6 18: 4c 89 f7 mov %r14,%rdi 1b: e8 50 26 6c 0a call 0xa6c2670 20: e8 6b 91 38 00 call 0x389190 25: fb sti 26: 48 8b 5d c0 mov -0x40(%rbp),%rbx * 2a: 48 8d bb f8 15 00 00 lea 0x15f8(%rbx),%rdi <-- trapping instruction 31: 48 89 f8 mov %rdi,%rax 34: 48 c1 e8 03 shr $0x3,%rax 38: 49 rex.WB 39: be 00 00 00 00 mov $0x0,%esi 3e: 00 fc add %bh,%ah --- 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.
