Hello, syzbot found the following issue on: HEAD commit: f76349cf4145 Linux 6.0-rc7 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=135e956c880000 kernel config: https://syzkaller.appspot.com/x/.config?x=ba0d23aa7e1ffaf5 dashboard link: https://syzkaller.appspot.com/bug?extid=2a0fbd1cb355de983130 compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1702ee9c880000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15ee7d40880000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2a0fbd1cb355de983130@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ VFS: brelse: Trying to free free buffer WARNING: CPU: 1 PID: 3609 at fs/buffer.c:1145 __brelse fs/buffer.c:1145 [inline] WARNING: CPU: 1 PID: 3609 at fs/buffer.c:1145 brelse+0x78/0xa0 include/linux/buffer_head.h:327 Modules linked in: CPU: 1 PID: 3609 Comm: udevd Not tainted 6.0.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 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 b7 18 e1 ff f0 ff 0b eb 1c e8 8d 2a 8e ff eb 15 e8 86 2a 8e ff 48 c7 c7 a0 99 9d 8a 31 c0 e8 58 b7 56 ff <0f> 0b 5b 5d c3 89 d9 80 e1 07 80 c1 03 38 c1 7c af 48 89 df e8 bf RSP: 0018:ffffc90003a5fac8 EFLAGS: 00010046 RAX: 78e8d475b9f8e400 RBX: ffff888073d6bee0 RCX: ffff88801c409d80 RDX: 0000000000000000 RSI: 0000000080000002 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff816bd40d R09: ffffed1017364f14 R10: ffffed1017364f14 R11: 1ffff11017364f13 R12: ffff8880b9b3acc0 R13: 0000000000000002 R14: ffff8880b9b35cf8 R15: dffffc0000000000 FS: 00007f6829c96840(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f23cc13e0a8 CR3: 000000001e07f000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __invalidate_bh_lrus+0x37/0x3c0 fs/buffer.c:1391 invalidate_bh_lru+0x66/0xb0 fs/buffer.c:1404 smp_call_function_many_cond+0xe88/0x16a0 kernel/smp.c:979 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1154 kill_bdev block/bdev.c:74 [inline] blkdev_flush_mapping+0x149/0x2c0 block/bdev.c:661 blkdev_put_whole block/bdev.c:692 [inline] blkdev_put+0x4a5/0x730 block/bdev.c:952 blkdev_close+0x55/0x80 block/fops.c:499 __fput+0x3b9/0x820 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: 0033:0x7f6829925fc3 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:00007ffd3b4cbbd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 00007f6829c966a8 RCX: 00007f6829925fc3 RDX: 000000000000001c RSI: 00007ffd3b4cb3d8 RDI: 0000000000000008 RBP: 000055da4dfde0b0 R08: 0000000000000007 R09: 000055da4dfefc00 R10: 00007f68299b4fc0 R11: 0000000000000246 R12: 0000000000000002 R13: 000055da4dfd8740 R14: 0000000000000008 R15: 000055da4dfb5910 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
