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: 13932 Comm: systemd-udevd Not tainted 5.14.0-rc5-next-20210816-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 90 05 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 35 13 00 00 48 8b 9b 90 05 00 00 48 b8 00 00 00 RSP: 0018:ffffc90000dc0cd8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100 RDX: 00000000000000b2 RSI: ffffffff83d225bd RDI: 0000000000000590 RBP: ffff88801b186800 R08: 0000000000000003 R09: ffff88801b186983 R10: ffffffff83d225b2 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000000 R14: ffff888145bf7200 R15: ffff88801b1868d0 FS: 00007f35e55fc8c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd5e4fdac8 CR3: 0000000080bf2000 CR4: 00000000001506e0 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+0x123/0x180 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:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:finish_task_switch.isra.0+0x221/0xa20 kernel/sched/core.c:4573 Code: 8b 3a 4c 89 e7 48 c7 02 00 00 00 00 ff d1 4d 85 ff 75 bf 4c 89 e7 e8 5e b7 e2 07 e8 69 f6 2b 00 fb 65 48 8b 1c 25 40 f0 01 00 <48> 8d bb 18 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 RSP: 0018:ffffc9000460ef20 EFLAGS: 00000246 RAX: 0000000000000007 RBX: ffff888025c68000 RCX: 1ffffffff1adc44d RDX: 0000000000000000 RSI: ffffffff817bea81 RDI: ffffffff814ff3c7 RBP: ffffc9000460ef60 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff817bea68 R11: 0000000000000001 R12: ffff8880b9d31a80 R13: ffff88808deb8000 R14: 0000000000000000 R15: ffff8880b9d31a98 context_switch kernel/sched/core.c:4714 [inline] __schedule+0x942/0x26f0 kernel/sched/core.c:5966 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6126 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] _raw_spin_unlock_irqrestore+0x57/0x70 kernel/locking/spinlock.c:191 __debug_object_init+0x409/0xd10 lib/debugobjects.c:605 __init_work+0x48/0x50 kernel/workqueue.c:504 create_task_io_context+0x1bd/0x440 block/blk-ioc.c:267 submit_bio_checks+0x12af/0x1ac0 block/blk-core.c:871 submit_bio_noacct+0x81/0xf20 block/blk-core.c:1017 submit_bio+0x1ea/0x470 block/blk-core.c:1094 mpage_bio_submit fs/mpage.c:66 [inline] mpage_readahead+0x589/0x750 fs/mpage.c:393 read_pages+0x1e4/0xfa0 mm/readahead.c:130 page_cache_ra_unbounded+0x64b/0x940 mm/readahead.c:239 do_page_cache_ra mm/readahead.c:269 [inline] force_page_cache_ra+0x3ba/0x5e0 mm/readahead.c:301 page_cache_sync_ra+0x107/0x200 mm/readahead.c:575 page_cache_sync_readahead include/linux/pagemap.h:1030 [inline] filemap_get_pages+0x2b2/0x1be0 mm/filemap.c:2550 filemap_read+0x2ca/0xe40 mm/filemap.c:2633 generic_file_read_iter+0x397/0x4f0 mm/filemap.c:2784 blkdev_read_iter+0x127/0x1c0 fs/block_dev.c:1482 call_read_iter include/linux/fs.h:2151 [inline] new_sync_read+0x41e/0x6e0 fs/read_write.c:415 vfs_read+0x35c/0x600 fs/read_write.c:496 ksys_read+0x12d/0x250 fs/read_write.c:634 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: 0033:0x7f35e4742210 Code: 73 01 c3 48 8b 0d 98 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d b9 c1 20 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24 RSP: 002b:00007ffd5e500cc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000560d5ce123e0 RCX: 00007f35e4742210 RDX: 0000000000000040 RSI: 0000560d5ce12408 RDI: 000000000000000f RBP: 0000560d5cdfeee0 R08: 0000000000000000 R09: 0000000000000070 R10: 000000000000006d R11: 0000000000000246 R12: 00000000080f0000 R13: 00000000080f0040 R14: 0000560d5cdfef30 R15: 0000000000000040 Modules linked in: ---[ end trace ff01396d223df1af ]--- 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 90 05 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 35 13 00 00 48 8b 9b 90 05 00 00 48 b8 00 00 00 RSP: 0018:ffffc90000dc0cd8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100 RDX: 00000000000000b2 RSI: ffffffff83d225bd RDI: 0000000000000590 RBP: ffff88801b186800 R08: 0000000000000003 R09: ffff88801b186983 R10: ffffffff83d225b2 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000000 R14: ffff888145bf7200 R15: ffff88801b1868d0 FS: 00007f35e55fc8c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd5e4fdac8 CR3: 0000000080bf2000 CR4: 00000000001506e0 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 68 13 test %ebp,0x13(%rax) 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 35 13 00 00 jne 0x1369 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)