general protection fault, probably for non-canonical address 0xdffffc00000000b2: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000590-0x0000000000000597] CPU: 1 PID: 2988 Comm: systemd-udevd Not tainted 5.14.0-rc6-next-20210818-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+0x149/0x1750 block/blk-wbt.c:360 Code: 03 80 3c 02 00 0f 85 79 13 00 00 48 8b 9b c8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 90 05 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 46 13 00 00 48 8b 9b 90 05 00 00 48 b8 00 00 00 RSP: 0018:ffffc90000dc0c98 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100 RDX: 00000000000000b2 RSI: ffffffff83d3c9cd RDI: 0000000000000590 RBP: ffff88801b07ec00 R08: 0000000000000003 R09: ffff88801b07ed83 R10: ffffffff83d3c9c2 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000000 R14: ffff88801b3da200 R15: ffff88801b07ecd0 FS: 00007fe5d94fa8c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000002832708 CR3: 00000000785b3000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: call_timer_fn+0x1ab/0x6c0 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+0x133/0x190 kernel/softirq.c:636 irq_exit_rcu+0x9/0x30 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:put_cpu_partial+0x155/0x240 mm/slub.c:2555 Code: 00 00 48 c7 c6 65 a9 bb 81 48 89 df e8 c4 f5 9f ff 4d 85 e4 75 58 9c 58 f6 c4 02 0f 85 be 00 00 00 4d 85 e4 74 01 fb 4d 85 f6 <74> 29 48 83 c4 08 4c 89 f6 48 89 ef 5b 5d 41 5c 41 5d 41 5e 41 5f RSP: 0018:ffffc9000bd87c38 EFLAGS: 00000286 RAX: 0000000000000092 RBX: ffff8880b9d35720 RCX: 1ffffffff1adc88d RDX: 0000000000000000 RSI: ffffffff817c9a51 RDI: ffffffff81bba9de RBP: ffff888010c42140 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff817c9a38 R11: 0000000000000001 R12: 0000000000000200 R13: 0000000000000001 R14: ffffea0002263600 R15: ffffea000225fa00 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5a/0xd0 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x185/0x210 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x96/0xb0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3194 [inline] kmem_cache_alloc+0x20d/0x390 mm/slub.c:3199 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags+0x9a/0xe0 include/linux/audit.h:319 user_path_at_empty+0x2b/0x90 fs/namei.c:2801 do_readlinkat+0xcd/0x2f0 fs/stat.c:443 __do_sys_readlinkat fs/stat.c:470 [inline] __se_sys_readlinkat fs/stat.c:467 [inline] __x64_sys_readlinkat+0x93/0x100 fs/stat.c:467 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fe5d836e0ba Code: 48 8b 0d e1 bd 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 0b 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d ae bd 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffdcff4dfc8 EFLAGS: 00000202 ORIG_RAX: 000000000000010b RAX: ffffffffffffffda RBX: 000055f6e3c3f6e0 RCX: 00007fe5d836e0ba RDX: 000055f6e3c3f6e0 RSI: 000055f6e3c17ce0 RDI: 00000000ffffff9c RBP: 0000000000000064 R08: 000055f6e2df5670 R09: 0000000000000070 R10: 0000000000000063 R11: 0000000000000202 R12: 000055f6e3c17ce0 R13: 00000000ffffff9c R14: 00007ffdcff4e020 R15: 0000000000000063 Modules linked in: ---[ end trace 772a24d20baa6cce ]--- RIP: 0010:latency_exceeded block/blk-wbt.c:237 [inline] RIP: 0010:wb_timer_fn+0x149/0x1750 block/blk-wbt.c:360 Code: 03 80 3c 02 00 0f 85 79 13 00 00 48 8b 9b c8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 90 05 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 46 13 00 00 48 8b 9b 90 05 00 00 48 b8 00 00 00 RSP: 0018:ffffc90000dc0c98 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100 RDX: 00000000000000b2 RSI: ffffffff83d3c9cd RDI: 0000000000000590 RBP: ffff88801b07ec00 R08: 0000000000000003 R09: ffff88801b07ed83 R10: ffffffff83d3c9c2 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000000 R14: ffff88801b3da200 R15: ffff88801b07ecd0 FS: 00007fe5d94fa8c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000002832708 CR3: 00000000785b3000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 03 80 3c 02 00 0f add 0xf00023c(%rax),%eax 6: 85 79 13 test %edi,0x13(%rcx) 9: 00 00 add %al,(%rax) b: 48 8b 9b c8 00 00 00 mov 0xc8(%rbx),%rbx 12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 19: fc ff df 1c: 48 8d bb 90 05 00 00 lea 0x590(%rbx),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 46 13 00 00 jne 0x137a 34: 48 8b 9b 90 05 00 00 mov 0x590(%rbx),%rbx 3b: 48 rex.W 3c: b8 .byte 0xb8 3d: 00 00 add %al,(%rax)