general protection fault, probably for non-canonical address 0xdffffc00000000aa: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000550-0x0000000000000557] CPU: 1 PID: 2986 Comm: systemd-udevd Not tainted 5.14.0-rc5-next-20210810-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:latency_exceeded block/blk-wbt.c:237 [inline] RIP: 0010:wb_timer_fn+0x149/0x1740 block/blk-wbt.c:360 Code: 03 80 3c 02 00 0f 85 68 13 00 00 48 8b 9b c8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 50 05 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 35 13 00 00 48 8b 9b 50 05 00 00 48 b8 00 00 00 RSP: 0018:ffffc90000dc0cd8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100 RDX: 00000000000000aa RSI: ffffffff83d107dd RDI: 0000000000000550 RBP: ffff88801ab4f000 R08: 0000000000000003 R09: ffff88801ab4f183 R10: ffffffff83d107d2 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000000 R14: ffff888019386980 R15: ffff88801ab4f0d0 FS: 00007fc9483928c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30424000 CR3: 00000000139f4000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:lock_acquire+0x33/0x510 kernel/locking/lockdep.c:5593 Code: df 41 57 41 89 f7 41 56 49 89 fe 41 55 41 89 d5 41 54 41 89 cc 55 44 89 c5 53 48 81 ec b0 00 00 00 48 8d 5c 24 10 4c 89 0c 24 <48> c7 44 24 10 b3 8a b5 41 48 c1 eb 03 48 c7 44 24 18 3a 23 14 8b RSP: 0018:ffffc90002b8fbd0 EFLAGS: 00000282 RAX: dffffc0000000000 RBX: ffffc90002b8fbe0 RCX: 0000000000000002 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8b97ea40 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: fffffbfff1769dd4 R11: 000000000000001f R12: 0000000000000002 R13: 0000000000000000 R14: ffffffff8b97ea40 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:267 [inline] rcu_read_lock include/linux/rcupdate.h:687 [inline] dput+0x79/0xbc0 fs/dcache.c:874 path_put+0x2d/0x60 fs/namei.c:546 vfs_statx+0x244/0x390 fs/stat.c:231 vfs_fstatat fs/stat.c:243 [inline] vfs_lstat include/linux/fs.h:3428 [inline] __do_sys_newlstat+0x91/0x110 fs/stat.c:398 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fc947204335 Code: 69 db 2b 00 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 83 ff 01 48 89 f0 77 30 48 89 c7 48 89 d6 b8 06 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 03 f3 c3 90 48 8b 15 31 db 2b 00 f7 d8 64 89 RSP: 002b:00007ffe9a838f88 EFLAGS: 00000246 ORIG_RAX: 0000000000000006 RAX: ffffffffffffffda RBX: 000055977b471810 RCX: 00007fc947204335 RDX: 00007ffe9a838fc0 RSI: 00007ffe9a838fc0 RDI: 000055977b470810 RBP: 00007ffe9a839080 R08: 00007fc9474c31c8 R09: 0000000000001010 R10: 00007fc9474c2b58 R11: 0000000000000246 R12: 000055977b470810 R13: 000055977b47083a R14: 000055977b46fd06 R15: 000055977b46fd0a Modules linked in: ---[ end trace 93d495f147e23ded ]--- RIP: 0010:latency_exceeded block/blk-wbt.c:237 [inline] RIP: 0010:wb_timer_fn+0x149/0x1740 block/blk-wbt.c:360 Code: 03 80 3c 02 00 0f 85 68 13 00 00 48 8b 9b c8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 50 05 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 35 13 00 00 48 8b 9b 50 05 00 00 48 b8 00 00 00 RSP: 0018:ffffc90000dc0cd8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100 RDX: 00000000000000aa RSI: ffffffff83d107dd RDI: 0000000000000550 RBP: ffff88801ab4f000 R08: 0000000000000003 R09: ffff88801ab4f183 R10: ffffffff83d107d2 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000000 R14: ffff888019386980 R15: ffff88801ab4f0d0 FS: 00007fc9483928c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30424000 CR3: 00000000139f4000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400