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: 24300 Comm: syz-executor.5 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: ffff88801acd8c00 R08: 0000000000000003 R09: ffff88801acd8d83 R10: ffffffff83d107d2 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000000 R14: ffff888145c10f80 R15: ffff88801acd8cd0 FS: 000000000344c400(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000240 CR3: 000000006fcac000 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+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+0x16/0x510 kernel/locking/lockdep.c:5593 Code: 6d 8d e8 6d 3b 60 00 e9 fb fe ff ff 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff 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 RSP: 0018:ffffc90005e4fa58 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000002 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8b97ea40 RBP: ffff888148282000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff82076d2c R11: 0000000000000000 R12: ffff888148284000 R13: 0000000000000000 R14: ffffffff8b97ea40 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:267 [inline] rcu_read_lock include/linux/rcupdate.h:687 [inline] ext4_get_group_desc+0x146/0x500 fs/ext4/balloc.c:284 recently_deleted fs/ext4/ialloc.c:683 [inline] find_inode_bit+0x1c4/0x580 fs/ext4/ialloc.c:729 __ext4_new_inode+0xc4d/0x5c40 fs/ext4/ialloc.c:1064 ext4_symlink+0x489/0xd50 fs/ext4/namei.c:3465 vfs_symlink fs/namei.c:4215 [inline] vfs_symlink+0x473/0x6a0 fs/namei.c:4200 do_symlinkat+0x27a/0x300 fs/namei.c:4245 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: 0033:0x465ef7 Code: 73 01 c3 48 c7 c1 bc ff ff ff 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 b8 58 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffcb9ff70e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000465ef7 RDX: 00007ffcb9ff71d3 RSI: 00000000004bfd7b RDI: 00007ffcb9ff71c0 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffcb9ff6f80 R10: 00007ffcb9ff6e37 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffcb9ff71c0 Modules linked in: ---[ end trace 73946db787d5c3ba ]--- 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: ffff88801acd8c00 R08: 0000000000000003 R09: ffff88801acd8d83 R10: ffffffff83d107d2 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000000 R14: ffff888145c10f80 R15: ffff88801acd8cd0 FS: 000000000344c400(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000240 CR3: 000000006fcac000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400