loop1: detected capacity change from 0 to 128 ====================================================== WARNING: possible circular locking dependency detected 6.2.0-rc5-next-20230127 #1 Not tainted ------------------------------------------------------ syz-executor.5/22502 is trying to acquire lock: FAT-fs (loop1): FAT read failed (blocknr 544) ffff88800ff8c170 (&journal->j_barrier){+.+.}-{3:3}, at: jbd2_journal_lock_updates+0x162/0x310 but task is already holding lock: ffff88800ff8ab90 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_change_inode_journal_flag+0x17f/0x550 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&sbi->s_writepages_rwsem){++++}-{0:0}: percpu_down_write+0x51/0x350 ext4_ind_migrate+0x23b/0x840 ext4_fileattr_set+0x1521/0x19f0 vfs_fileattr_set+0x7a2/0xbd0 do_vfs_ioctl+0xfc1/0x1690 __x64_sys_ioctl+0x110/0x210 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc -> #2 (&sb->s_type->i_mutex_key#6){++++}-{3:3}: down_read+0x3d/0x50 ext4_bmap+0x52/0x470 bmap+0xb0/0x130 jbd2_journal_bmap+0xac/0x1d0 jbd2_journal_flush+0x87f/0xc90 __ext4_ioctl+0x9fd/0x4330 __x64_sys_ioctl+0x19e/0x210 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc -> #1 (&journal->j_checkpoint_mutex){+.+.}-{3:3}: mutex_lock_io_nested+0x149/0x1300 jbd2_journal_flush+0x19e/0xc90 __ext4_ioctl+0x9fd/0x4330 __x64_sys_ioctl+0x19e/0x210 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc -> #0 (&journal->j_barrier){+.+.}-{3:3}: __lock_acquire+0x2da7/0x63b0 lock_acquire.part.0+0xec/0x320 __mutex_lock+0x133/0x14a0 jbd2_journal_lock_updates+0x162/0x310 ext4_change_inode_journal_flag+0x187/0x550 ext4_fileattr_set+0x14fa/0x19f0 vfs_fileattr_set+0x7a2/0xbd0 do_vfs_ioctl+0xfc1/0x1690 __x64_sys_ioctl+0x110/0x210 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc other info that might help us debug this: Chain exists of: &journal->j_barrier --> &sb->s_type->i_mutex_key#6 --> &sbi->s_writepages_rwsem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sbi->s_writepages_rwsem); lock(&sb->s_type->i_mutex_key#6); lock(&sbi->s_writepages_rwsem); lock(&journal->j_barrier); *** DEADLOCK *** 4 locks held by syz-executor.5/22502: #0: ffff88800ff88438 (sb_writers#3){.+.+}-{0:0}, at: do_vfs_ioctl+0xf86/0x1690 #1: ffff88804757c990 (&sb->s_type->i_mutex_key#6){++++}-{3:3}, at: vfs_fileattr_set+0x14c/0xbd0 #2: ffff88804757cb30 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_change_inode_journal_flag+0x126/0x550 #3: ffff88800ff8ab90 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_change_inode_journal_flag+0x17f/0x550 stack backtrace: CPU: 0 PID: 22502 Comm: syz-executor.5 Not tainted 6.2.0-rc5-next-20230127 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0x91/0xf0 check_noncircular+0x263/0x2e0 __lock_acquire+0x2da7/0x63b0 lock_acquire.part.0+0xec/0x320 __mutex_lock+0x133/0x14a0 jbd2_journal_lock_updates+0x162/0x310 ext4_change_inode_journal_flag+0x187/0x550 ext4_fileattr_set+0x14fa/0x19f0 vfs_fileattr_set+0x7a2/0xbd0 do_vfs_ioctl+0xfc1/0x1690 __x64_sys_ioctl+0x110/0x210 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7f08cbdcfb19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f08c9345188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f08cbee2f60 RCX: 00007f08cbdcfb19 RDX: 0000000020000040 RSI: 0000000040086602 RDI: 0000000000000003 RBP: 00007f08cbe29f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe537a74ef R14: 00007f08c9345300 R15: 0000000000022000 loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 544) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 3072) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 3072) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 3584) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 3584) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 65007) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 65007) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 65534) loop1: detected capacity change from 0 to 128 loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 544) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 544) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 800) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 800) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 1056) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 1312) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 1312) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 1568) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 1568) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 1824) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 1824) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 6176) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 7200) audit: type=1400 audit(1674818720.068:36): avc: denied { watch_reads } for pid=22815 comm="syz-executor.4" path="/syzkaller-testdir086246603/syzkaller.nH2x94/724/file0" dev="sda" ino=16110 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=dir permissive=1 loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 27168) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 27168) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 57376) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 57376) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 65056) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 65056) loop1: detected capacity change from 0 to 128 loop1: detected capacity change from 0 to 128 loop1: detected capacity change from 0 to 128 loop1: detected capacity change from 0 to 128 loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 65312) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): FAT read failed (blocknr 65312) loop1: detected capacity change from 0 to 128 loop1: detected capacity change from 0 to 128 loop1: detected capacity change from 0 to 128 loop1: detected capacity change from 0 to 128 loop1: detected capacity change from 0 to 128 loop1: detected capacity change from 0 to 128 loop1: detected capacity change from 0 to 128 FAT-fs (loop1): bogus number of FAT structure FAT-fs (loop1): Can't find a valid FAT filesystem I/O error, dev loop1, sector 1 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 Buffer I/O error on dev loop1, logical block 1, async page read I/O error, dev loop1, sector 2 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 Buffer I/O error on dev loop1, logical block 2, async page read I/O error, dev loop1, sector 3 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 Buffer I/O error on dev loop1, logical block 3, async page read I/O error, dev loop1, sector 4 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 Buffer I/O error on dev loop1, logical block 4, async page read I/O error, dev loop1, sector 5 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 Buffer I/O error on dev loop1, logical block 5, async page read I/O error, dev loop1, sector 6 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 Buffer I/O error on dev loop1, logical block 6, async page read loop1: detected capacity change from 0 to 128 FAT-fs (loop1): bogus number of FAT structure FAT-fs (loop1): Can't find a valid FAT filesystem loop1: detected capacity change from 0 to 128 FAT-fs (loop1): bogus number of directory entries (2) FAT-fs (loop1): Can't find a valid FAT filesystem loop1: detected capacity change from 0 to 128 FAT-fs (loop1): bogus number of directory entries (3) FAT-fs (loop1): Can't find a valid FAT filesystem loop1: detected capacity change from 0 to 128 FAT-fs (loop1): bogus number of directory entries (4) FAT-fs (loop1): Can't find a valid FAT filesystem loop1: detected capacity change from 0 to 128 FAT-fs (loop1): bogus number of directory entries (4) FAT-fs (loop1): Can't find a valid FAT filesystem loop1: detected capacity change from 0 to 128 FAT-fs (loop1): bogus number of directory entries (5) FAT-fs (loop1): Can't find a valid FAT filesystem loop1: detected capacity change from 0 to 128 FAT-fs (loop1): bogus number of directory entries (5) FAT-fs (loop1): Can't find a valid FAT filesystem loop1: detected capacity change from 0 to 128 FAT-fs (loop1): bogus number of directory entries (6) FAT-fs (loop1): Can't find a valid FAT filesystem loop1: detected capacity change from 0 to 128 FAT-fs (loop1): bogus number of directory entries (6) FAT-fs (loop1): Can't find a valid FAT filesystem loop1: detected capacity change from 0 to 128 FAT-fs (loop1): bogus number of directory entries (7) FAT-fs (loop1): Can't find a valid FAT filesystem loop1: detected capacity change from 0 to 128 FAT-fs (loop1): bogus number of directory entries (7) FAT-fs (loop1): Can't find a valid FAT filesystem loop1: detected capacity change from 0 to 128 FAT-fs (loop1): bogus number of directory entries (8) FAT-fs (loop1): Can't find a valid FAT filesystem loop1: detected capacity change from 0 to 128 FAT-fs (loop1): bogus number of directory entries (8) FAT-fs (loop1): Can't find a valid FAT filesystem loop1: detected capacity change from 0 to 128 loop1: detected capacity change from 0 to 128 FAT-fs (loop1): bogus number of directory entries (24) FAT-fs (loop1): Can't find a valid FAT filesystem loop1: detected capacity change from 0 to 128 FAT-fs (loop1): bogus number of directory entries (28) FAT-fs (loop1): Can't find a valid FAT filesystem loop1: detected capacity change from 0 to 128 FAT-fs (loop1): bogus number of directory entries (30) FAT-fs (loop1): Can't find a valid FAT filesystem loop1: detected capacity change from 0 to 128 loop1: detected capacity change from 0 to 128 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium EXT4-fs warning (device sda): verify_group_input:150: Cannot add at group 0 (only 16 groups) loop1: detected capacity change from 0 to 128 FAT-fs (loop1): bogus number of directory entries (254) FAT-fs (loop1): Can't find a valid FAT filesystem EXT4-fs warning (device sda): verify_group_input:150: Cannot add at group 0 (only 16 groups) loop1: detected capacity change from 0 to 128 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium loop1: detected capacity change from 0 to 128 EXT4-fs warning (device sda): verify_group_input:150: Cannot add at group 0 (only 16 groups) mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium loop1: detected capacity change from 0 to 128 EXT4-fs warning (device sda): verify_group_input:150: Cannot add at group 0 (only 16 groups) mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium