syzbot has found a reproducer for the following issue on: HEAD commit: 6abab1b81b65 Add linux-next specific files for 20220202 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=178ef35bb00000 kernel config: https://syzkaller.appspot.com/x/.config?x=b8d8750556896349 dashboard link: https://syzkaller.appspot.com/bug?extid=0b9cadf5fc45a98a5083 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=150341d4700000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15649300700000
IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: [email protected] F2FS-fs (loop0): Can't find valid F2FS filesystem in 2th superblock F2FS-fs (loop0): invalid crc_offset: 0 F2FS-fs (loop0): Disable nat_bits due to incorrect cp_ver (8221872453892455638, 0) F2FS-fs (loop0): Try to recover 2th superblock, ret: 0 F2FS-fs (loop0): Mounted with checkpoint version = 7ad43cd6 ============================================ WARNING: possible recursive locking detected 5.17.0-rc2-next-20220202-syzkaller #0 Not tainted -------------------------------------------- syz-executor316/3595 is trying to acquire lock: ffff88801d514390 (&sem->internal_rwsem#2){++++}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2156 [inline] ffff88801d514390 (&sem->internal_rwsem#2){++++}-{3:3}, at: f2fs_write_checkpoint+0x535/0x5c90 fs/f2fs/checkpoint.c:1616 but task is already holding lock: ffff88801d515398 (&sem->internal_rwsem#2){++++}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2156 [inline] ffff88801d515398 (&sem->internal_rwsem#2){++++}-{3:3}, at: f2fs_issue_checkpoint+0x149/0x480 fs/f2fs/checkpoint.c:1835 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&sem->internal_rwsem#2); lock(&sem->internal_rwsem#2); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by syz-executor316/3595: #0: ffff888074db00e0 (&type->s_umount_key#46){+.+.}-{3:3}, at: deactivate_super+0xa5/0xd0 fs/super.c:362 #1: ffff88801d515398 (&sem->internal_rwsem#2){++++}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2156 [inline] #1: ffff88801d515398 (&sem->internal_rwsem#2){++++}-{3:3}, at: f2fs_issue_checkpoint+0x149/0x480 fs/f2fs/checkpoint.c:1835 stack backtrace: CPU: 0 PID: 3595 Comm: syz-executor316 Not tainted 5.17.0-rc2-next-20220202-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_deadlock_bug kernel/locking/lockdep.c:2956 [inline] check_deadlock kernel/locking/lockdep.c:2999 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire.cold+0x149/0x3ab kernel/locking/lockdep.c:5027 lock_acquire kernel/locking/lockdep.c:5639 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5604 down_write+0x90/0x150 kernel/locking/rwsem.c:1514 f2fs_down_write fs/f2fs/f2fs.h:2156 [inline] f2fs_write_checkpoint+0x535/0x5c90 fs/f2fs/checkpoint.c:1616 __write_checkpoint_sync fs/f2fs/checkpoint.c:1746 [inline] f2fs_issue_checkpoint+0x156/0x480 fs/f2fs/checkpoint.c:1843 f2fs_sync_fs+0x20f/0x420 fs/f2fs/super.c:1644 sync_filesystem.part.0+0x13c/0x1d0 fs/sync.c:66 sync_filesystem+0x8b/0xc0 fs/sync.c:43 generic_shutdown_super+0x70/0x400 fs/super.c:445 kill_block_super+0x97/0xf0 fs/super.c:1394 kill_f2fs_super+0x2b3/0x3c0 fs/f2fs/super.c:4523 deactivate_locked_super+0x94/0x160 fs/super.c:332 deactivate_super+0xad/0xd0 fs/super.c:363 cleanup_mnt+0x3a2/0x540 fs/namespace.c:1159 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xb29/0x2b10 kernel/exit.c:806 do_group_exit+0xd2/0x2f0 kernel/exit.c:935 __do_sys_exit_group kernel/exit.c:946 [inline] __se_sys_exit_group kernel/exit.c:944 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:944 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: 0033:0x7f93b7998639 Code: Unable to access opcode bytes at RIP 0x7f93b799860f. RSP: 002b:00007fffe1dc7708 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f93b7a0d3 _______________________________________________ Linux-f2fs-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
