------------[ cut here ]------------ VFS: brelse: Trying to free free buffer WARNING: CPU: 1 PID: 3909 at fs/buffer.c:1145 __brelse fs/buffer.c:1145 [inline] WARNING: CPU: 1 PID: 3909 at fs/buffer.c:1145 brelse+0x78/0xa0 include/linux/buffer_head.h:327 Modules linked in: CPU: 1 PID: 3909 Comm: udevd Not tainted 6.0.0-syzkaller-09039-ga6afa4199d3d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 RIP: 0010:__brelse fs/buffer.c:1145 [inline] RIP: 0010:brelse+0x78/0xa0 include/linux/buffer_head.h:327 Code: df be 04 00 00 00 e8 47 17 e1 ff f0 ff 0b eb 1c e8 4d ab 8d ff eb 15 e8 46 ab 8d ff 48 c7 c7 e0 b1 9d 8a 31 c0 e8 78 10 56 ff <0f> 0b 5b 5d c3 89 d9 80 e1 07 80 c1 03 38 c1 7c af 48 89 df e8 4f RSP: 0018:ffffc9000521faa8 EFLAGS: 00010046 RAX: 6ca3e2f8b7697600 RBX: ffff88807680c148 RCX: ffff88807b3b8000 RDX: 0000000000000000 RSI: 0000000080000002 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff816af63d R09: ffffed1017364f13 R10: ffffed1017364f13 R11: 1ffff11017364f12 R12: ffff8880b9b35d38 R13: 0000000000000002 R14: ffff8880b9b35cf8 R15: dffffc0000000000 FS: 00007fa3ba3c1840(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8d8597e1b8 CR3: 00000000229fa000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __invalidate_bh_lrus+0x206/0x3c0 fs/buffer.c:1391 invalidate_bh_lru+0x66/0xb0 fs/buffer.c:1404 smp_call_function_many_cond+0xe68/0x1670 kernel/smp.c:978 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1153 kill_bdev block/bdev.c:75 [inline] blkdev_flush_mapping+0x149/0x2c0 block/bdev.c:662 blkdev_put_whole block/bdev.c:693 [inline] blkdev_put+0x4a5/0x730 block/bdev.c:953 blkdev_close+0x55/0x80 block/fops.c:499 __fput+0x3ba/0x880 fs/file_table.c:320 task_work_run+0x146/0x1c0 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x124/0x150 kernel/entry/common.c:169 exit_to_user_mode_prepare+0xb2/0x140 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:294 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fa3ba7a8fc3 Code: 48 ff ff ff b8 ff ff ff ff e9 3e ff ff ff 66 0f 1f 84 00 00 00 00 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 RSP: 002b:00007ffd7d09e268 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 00007fa3ba3c16a8 RCX: 00007fa3ba7a8fc3 RDX: 000000000000001c RSI: 00007ffd7d09da68 RDI: 0000000000000008 RBP: 000055d2e27fac50 R08: 0000000000000007 R09: 000055d2e2800530 R10: 00007fa3ba837fc0 R11: 0000000000000246 R12: 0000000000000002 R13: 000055d2e27fe1e0 R14: 0000000000000008 R15: 000055d2e27d5910