====================================================== WARNING: possible circular locking dependency detected 6.2.0-rc6-next-20230131 #1 Not tainted ------------------------------------------------------ syz-executor.7/42396 is trying to acquire lock: ffff88800ffb4170 (&journal->j_barrier){+.+.}-{3:3}, at: jbd2_journal_lock_updates+0x162/0x310 but task is already holding lock: ffff88800ffb2b90 (&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.7/42396: #0: ffff88800ffb0438 (sb_writers#3){.+.+}-{0:0}, at: do_vfs_ioctl+0xf86/0x1690 #1: ffff8880436ee760 (&sb->s_type->i_mutex_key#6){++++}-{3:3}, at: vfs_fileattr_set+0x14c/0xbd0 #2: ffff8880436ee900 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_change_inode_journal_flag+0x126/0x550 #3: ffff88800ffb2b90 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_change_inode_journal_flag+0x17f/0x550 stack backtrace: CPU: 1 PID: 42396 Comm: syz-executor.7 Not tainted 6.2.0-rc6-next-20230131 #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: 0033:0x7fe9f54f3b19 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:00007fe9f2a69188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fe9f5606f60 RCX: 00007fe9f54f3b19 RDX: 0000000020000040 RSI: 0000000040086602 RDI: 0000000000000003 RBP: 00007fe9f554df6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc7bc8a6af R14: 00007fe9f2a69300 R15: 0000000000022000 EXT4-fs (sda): re-mounted 7b5d9a40-9011-49ec-8035-27953f97a4d8. Quota mode: writeback. audit: type=1400 audit(2000000105.556:31): avc: denied { relabelto } for pid=42626 comm="syz-executor.2" name="TCP" dev="sockfs" ino=54872 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:ld_so_cache_t:s0 tclass=tcp_socket permissive=1 ieee80211 phy90: Selected rate control algorithm 'minstrel_ht' ieee80211 phy91: Selected rate control algorithm 'minstrel_ht' ieee80211 phy92: Selected rate control algorithm 'minstrel_ht' ieee80211 phy93: Selected rate control algorithm 'minstrel_ht' mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium ieee80211 phy94: Selected rate control algorithm 'minstrel_ht' mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium EXT4-fs (sda): re-mounted 7b5d9a40-9011-49ec-8035-27953f97a4d8. Quota mode: writeback. EXT4-fs (sda): re-mounted 7b5d9a40-9011-49ec-8035-27953f97a4d8. Quota mode: writeback. mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium random: crng reseeded on system resumption Unrecognized hibernate image header format! PM: hibernation: Image mismatch: architecture specific data random: crng reseeded on system resumption Unrecognized hibernate image header format! PM: hibernation: Image mismatch: architecture specific data audit: type=1326 audit(2000000112.967:32): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=44094 comm="syz-executor.5" exe="/syz-executor.5" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f225416fb19 code=0x0 audit: type=1326 audit(2000000113.018:33): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=44094 comm="syz-executor.5" exe="/syz-executor.5" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f225416fb19 code=0x0 random: crng reseeded on system resumption Unrecognized hibernate image header format! PM: hibernation: Image mismatch: architecture specific data audit: type=1326 audit(2000000113.799:34): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=44094 comm="syz-executor.5" exe="/syz-executor.5" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f225416fb19 code=0x0 audit: type=1326 audit(2000000113.851:35): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=44094 comm="syz-executor.5" exe="/syz-executor.5" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f225416fb19 code=0x0 random: crng reseeded on system resumption Unrecognized hibernate image header format! PM: hibernation: Image mismatch: architecture specific data random: crng reseeded on system resumption Unrecognized hibernate image header format! PM: hibernation: Image mismatch: architecture specific data tmpfs: Bad value for 'mpol' tmpfs: Bad value for 'mpol'