Hello, syzbot found the following issue on: HEAD commit: 46452d3786a8 Merge tag 'sound-6.0-rc8' of git://git.kernel.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=154595ef080000 kernel config: https://syzkaller.appspot.com/x/.config?x=755695d26ad09807 dashboard link: https://syzkaller.appspot.com/bug?extid=7902cd7684bc35306224 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=127543c4880000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1740b138880000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7902cd7684bc35306224@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ VFS: brelse: Trying to free free buffer WARNING: CPU: 0 PID: 3604 at fs/buffer.c:1145 __brelse fs/buffer.c:1145 [inline] WARNING: CPU: 0 PID: 3604 at fs/buffer.c:1145 __brelse+0x67/0xa0 fs/buffer.c:1139 Modules linked in: CPU: 0 PID: 3604 Comm: syz-executor576 Not tainted 6.0.0-rc7-syzkaller-00042-g46452d3786a8 #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+0x67/0xa0 fs/buffer.c:1139 Code: 7c 04 84 d2 75 4e 44 8b 63 60 31 ff 44 89 e6 e8 8f 57 95 ff 45 85 e4 75 1c e8 c5 5a 95 ff 48 c7 c7 00 93 fc 89 e8 5b 6f 54 07 <0f> 0b 5b 5d 41 5c e9 ae 5a 95 ff e8 a9 5a 95 ff be 04 00 00 00 48 RSP: 0018:ffffc9000379fbb0 EFLAGS: 00010086 RAX: 0000000000000000 RBX: ffff8880747e4bc8 RCX: 0000000000000000 RDX: ffff888024c61d80 RSI: ffffffff8161f2a8 RDI: fffff520006f3f68 RBP: ffff8880747e4c28 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000002 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff8880b9a35f80 R15: 0000000000000008 FS: 0000555556bf6300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff88e983290 CR3: 00000000715c2000 CR4: 0000000000350ef0 Call Trace: <TASK> brelse include/linux/buffer_head.h:327 [inline] __invalidate_bh_lrus fs/buffer.c:1391 [inline] invalidate_bh_lru+0x99/0x150 fs/buffer.c:1404 smp_call_function_many_cond+0x10e2/0x1430 kernel/smp.c:979 on_each_cpu_cond_mask+0x56/0xa0 kernel/smp.c:1154 kill_bdev block/bdev.c:74 [inline] blkdev_flush_mapping+0x136/0x2f0 block/bdev.c:661 blkdev_put_whole+0xd1/0xf0 block/bdev.c:692 blkdev_put+0x226/0x770 block/bdev.c:952 deactivate_locked_super+0x94/0x160 fs/super.c:332 deactivate_super+0xad/0xd0 fs/super.c:363 cleanup_mnt+0x2ae/0x3d0 fs/namespace.c:1186 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 ptrace_notify+0x114/0x140 kernel/signal.c:2353 ptrace_report_syscall include/linux/ptrace.h:420 [inline] ptrace_report_syscall_exit include/linux/ptrace.h:482 [inline] syscall_exit_work kernel/entry/common.c:249 [inline] syscall_exit_to_user_mode_prepare+0x129/0x280 kernel/entry/common.c:276 __syscall_exit_to_user_mode_work kernel/entry/common.c:281 [inline] syscall_exit_to_user_mode+0x9/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7ff88e90ec27 Code: 07 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe36cd2398 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007ff88e90ec27 RDX: 00007ffe36cd2459 RSI: 000000000000000a RDI: 00007ffe36cd2450 RBP: 00007ffe36cd2450 R08: 00000000ffffffff R09: 00007ffe36cd2230 R10: 0000555556bf7653 R11: 0000000000000202 R12: 00007ffe36cd34d0 R13: 0000555556bf75f0 R14: 00007ffe36cd23c0 R15: 0000000000000005 </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
