====================================================== WARNING: possible circular locking dependency detected 6.0.0-rc1-next-20220817 #1 Not tainted ------------------------------------------------------ syz-executor.1/6274 is trying to acquire lock: ffff88800ffc8170 (&journal->j_barrier){+.+.}-{3:3}, at: jbd2_journal_lock_updates+0x15e/0x310 but task is already holding lock: ffff88800ffbebd0 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_change_inode_journal_flag+0x177/0x530 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&sbi->s_writepages_rwsem){++++}-{0:0}: ext4_writepages+0x1d2/0x3690 do_writepages+0x1b0/0x6a0 filemap_fdatawrite_wbc+0x147/0x1b0 __filemap_fdatawrite_range+0xb6/0x100 filemap_write_and_wait_range+0x89/0x110 __iomap_dio_rw+0x5ed/0x1bd0 iomap_dio_rw+0x3c/0xa0 ext4_file_read_iter+0x268/0x400 generic_file_splice_read+0x187/0x4d0 do_splice_to+0x1bc/0x240 splice_direct_to_actor+0x2ac/0x8c0 do_splice_direct+0x1b8/0x290 do_sendfile+0xb1d/0x1280 __x64_sys_sendfile64+0x1d1/0x210 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #2 (&sb->s_type->i_mutex_key#6){++++}-{3:3}: down_read+0x98/0x450 ext4_bmap+0x4e/0x470 bmap+0xac/0x120 jbd2_journal_bmap+0xa8/0x180 jbd2_journal_flush+0x853/0xc00 __ext4_ioctl+0x9e9/0x4090 __x64_sys_ioctl+0x19a/0x210 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #1 (&journal->j_checkpoint_mutex){+.+.}-{3:3}: mutex_lock_io_nested+0x148/0x1310 jbd2_journal_flush+0x19a/0xc00 __ext4_ioctl+0x9e9/0x4090 __x64_sys_ioctl+0x19a/0x210 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (&journal->j_barrier){+.+.}-{3:3}: __lock_acquire+0x2a02/0x5e70 lock_acquire+0x1a2/0x530 __mutex_lock+0x136/0x14d0 jbd2_journal_lock_updates+0x15e/0x310 ext4_change_inode_journal_flag+0x17f/0x530 ext4_fileattr_set+0x140d/0x18a0 vfs_fileattr_set+0x77c/0xb80 do_vfs_ioctl+0xfc2/0x1610 __x64_sys_ioctl+0x10c/0x210 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd 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.1/6274: #0: ffff88800ffbc438 (sb_writers#3){.+.+}-{0:0}, at: do_vfs_ioctl+0xf87/0x1610 #1: ffff88801da921d0 (&sb->s_type->i_mutex_key#6){++++}-{3:3}, at: vfs_fileattr_set+0x148/0xb80 #2: ffff88801da92370 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_change_inode_journal_flag+0x11e/0x530 #3: ffff88800ffbebd0 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_change_inode_journal_flag+0x177/0x530 stack backtrace: CPU: 1 PID: 6274 Comm: syz-executor.1 Not tainted 6.0.0-rc1-next-20220817 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: dump_stack_lvl+0x8b/0xb3 check_noncircular+0x263/0x2e0 __lock_acquire+0x2a02/0x5e70 lock_acquire+0x1a2/0x530 __mutex_lock+0x136/0x14d0 jbd2_journal_lock_updates+0x15e/0x310 ext4_change_inode_journal_flag+0x17f/0x530 ext4_fileattr_set+0x140d/0x18a0 vfs_fileattr_set+0x77c/0xb80 do_vfs_ioctl+0xfc2/0x1610 __x64_sys_ioctl+0x10c/0x210 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f2580c8db19 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:00007f257e203188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f2580da0f60 RCX: 00007f2580c8db19 RDX: 0000000020000080 RSI: 0000000040086602 RDI: 0000000000000005 RBP: 00007f2580ce7f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffde5f06def R14: 00007f257e203300 R15: 0000000000022000 capability: warning: `syz-executor.5' uses 32-bit capabilities (legacy support in use) netlink: 'syz-executor.0': attribute type 29 has an invalid length. netlink: 'syz-executor.0': attribute type 29 has an invalid length. netlink: 'syz-executor.0': attribute type 29 has an invalid length. netlink: 'syz-executor.0': attribute type 29 has an invalid length. netlink: 'syz-executor.0': attribute type 29 has an invalid length. netlink: 'syz-executor.0': attribute type 29 has an invalid length. Zero length message leads to an empty skb netlink: 'syz-executor.0': attribute type 29 has an invalid length. netlink: 'syz-executor.0': attribute type 29 has an invalid length. raw_sendmsg: syz-executor.6 forgot to set AF_INET. Fix it! netlink: 'syz-executor.0': attribute type 29 has an invalid length. netlink: 'syz-executor.0': attribute type 29 has an invalid length. audit: type=1400 audit(1660734993.953:17): avc: denied { ingress } for pid=6399 comm="syz-executor.6" saddr=172.20.20.187 daddr=172.20.20.170 netif=lo scontext=system_u:object_r:policy_src_t:s0 tcontext=system_u:object_r:netif_t:s0 tclass=netif permissive=1 audit: type=1400 audit(1660734993.954:18): avc: denied { recvfrom } for pid=6399 comm="syz-executor.6" saddr=172.20.20.187 daddr=172.20.20.170 netif=lo scontext=system_u:object_r:policy_src_t:s0 tcontext=system_u:object_r:node_t:s0 tclass=node permissive=1 audit: type=1400 audit(1660734993.954:19): avc: denied { recv } for pid=6399 comm="syz-executor.6" saddr=172.20.20.187 daddr=172.20.20.170 netif=lo scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:policy_src_t:s0 tclass=peer permissive=1 audit: type=1326 audit(1660734995.660:20): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=6533 comm="syz-executor.4" exe="/syz-executor.4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f5f5093cb19 code=0x0 audit: type=1326 audit(1660734996.594:21): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=6584 comm="syz-executor.4" exe="/syz-executor.4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f5f5093cb19 code=0x0 audit: type=1326 audit(1660734997.548:22): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=6609 comm="syz-executor.4" exe="/syz-executor.4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f5f5093cb19 code=0x0 audit: type=1326 audit(1660734998.552:23): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=6651 comm="syz-executor.4" exe="/syz-executor.4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f5f5093cb19 code=0x0 syz-executor.1 (6647) used greatest stack depth: 23512 bytes left syz-executor.5 (6704) used greatest stack depth: 23248 bytes left