====================================================== WARNING: possible circular locking dependency detected 6.0.0-rc3-next-20220829 #1 Not tainted ------------------------------------------------------ syz-executor.7/11914 is trying to acquire lock: ffff88800c928400 (&sb->s_type->i_mutex_key#6){++++}-{3:3}, at: ext4_bmap+0x4e/0x470 but task is already holding lock: ffff8880100323f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: jbd2_journal_flush+0x48b/0xc00 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&journal->j_checkpoint_mutex){+.+.}-{3:3}: mutex_lock_io_nested+0x148/0x1310 jbd2_journal_flush+0x19a/0xc00 ext4_ioctl_group_add+0x2b3/0x580 __ext4_ioctl+0x6c7/0x4090 __x64_sys_ioctl+0x19a/0x210 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #2 (&journal->j_barrier){+.+.}-{3:3}: __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 -> #1 (&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_write_iter+0xa96/0x1820 do_iter_readv_writev+0x211/0x3c0 do_iter_write+0x18b/0x700 vfs_iter_write+0x70/0xa0 iter_file_splice_write+0x73a/0xca0 direct_splice_actor+0x10f/0x170 splice_direct_to_actor+0x336/0x8c0 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 -> #0 (&sb->s_type->i_mutex_key#6){++++}-{3:3}: __lock_acquire+0x2a02/0x5e70 lock_acquire+0x1a2/0x530 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 other info that might help us debug this: Chain exists of: &sb->s_type->i_mutex_key#6 --> &journal->j_barrier --> &journal->j_checkpoint_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&journal->j_checkpoint_mutex); lock(&journal->j_barrier); lock(&journal->j_checkpoint_mutex); lock(&sb->s_type->i_mutex_key#6); *** DEADLOCK *** 2 locks held by syz-executor.7/11914: #0: ffff888010032170 (&journal->j_barrier){+.+.}-{3:3}, at: jbd2_journal_lock_updates+0x15e/0x310 #1: ffff8880100323f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: jbd2_journal_flush+0x48b/0xc00 stack backtrace: CPU: 1 PID: 11914 Comm: syz-executor.7 Not tainted 6.0.0-rc3-next-20220829 #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 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 RIP: 0033:0x7f3135f28b19 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:00007f313349e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f313603bf60 RCX: 00007f3135f28b19 RDX: 0000000020000240 RSI: 000000004004662b RDI: 0000000000000006 RBP: 00007f3135f82f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff5989331f R14: 00007f313349e300 R15: 0000000000022000 audit: type=1326 audit(1661860192.144:38): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=11923 comm="syz-executor.5" exe="/syz-executor.5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f2e03a55b19 code=0x0 audit: type=1326 audit(1661860192.170:39): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=11924 comm="syz-executor.6" exe="/syz-executor.6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f2171948b19 code=0x0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=2561 sclass=netlink_route_socket pid=11947 comm=syz-executor.2 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 'syz-executor.1': attribute type 1 has an invalid length. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=2561 sclass=netlink_route_socket pid=11961 comm=syz-executor.2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=2561 sclass=netlink_route_socket pid=11964 comm=syz-executor.5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=2561 sclass=netlink_route_socket pid=11968 comm=syz-executor.0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=2561 sclass=netlink_route_socket pid=11982 comm=syz-executor.5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=2561 sclass=netlink_route_socket pid=11985 comm=syz-executor.2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=2561 sclass=netlink_route_socket pid=11987 comm=syz-executor.0 kauditd_printk_skb: 1 callbacks suppressed audit: type=1400 audit(1661860194.021:41): avc: denied { watch_reads } for pid=11998 comm="syz-executor.7" path="/syzkaller-testdir367388797/syzkaller.rgleNq/339/file0" dev="sda" ino=16068 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=dir permissive=1 tmpfs: Bad value for 'mpol' tmpfs: Bad value for 'mpol' SELinux: unrecognized netlink message: protocol=0 nlmsg_type=2561 sclass=netlink_route_socket pid=11999 comm=syz-executor.2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=2561 sclass=netlink_route_socket pid=12006 comm=syz-executor.5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=2561 sclass=netlink_route_socket pid=12009 comm=syz-executor.0 sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. netlink: 20 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 20 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 4436 bytes leftover after parsing attributes in process `syz-executor.3'. blktrace: Concurrent blktraces are not allowed on sg0 netlink: 4436 bytes leftover after parsing attributes in process `syz-executor.3'. platform regulatory.0: Direct firmware load for regulatory.db failed with error -2 platform regulatory.0: Direct firmware load for regulatory.db failed with error -2 netlink: 4436 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 4436 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 4436 bytes leftover after parsing attributes in process `syz-executor.3'. platform regulatory.0: Direct firmware load for regulatory.db failed with error -2 netlink: 4436 bytes leftover after parsing attributes in process `syz-executor.0'. platform regulatory.0: Direct firmware load for regulatory.db failed with error -2 netlink: 4436 bytes leftover after parsing attributes in process `syz-executor.3'. platform regulatory.0: Direct firmware load for regulatory.db failed with error -2 platform regulatory.0: Direct firmware load for regulatory.db failed with error -2 platform regulatory.0: Direct firmware load for regulatory.db failed with error -2 platform regulatory.0: Direct firmware load for regulatory.db failed with error -2 audit: type=1400 audit(1661860200.031:42): avc: denied { ingress } for pid=12419 comm="syz-executor.6" saddr=172.20.20.187 src=20003 daddr=172.20.20.10 dest=56412 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(1661860200.032:43): avc: denied { recvfrom } for pid=12419 comm="syz-executor.6" saddr=172.20.20.187 src=20003 daddr=172.20.20.10 dest=56412 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(1661860200.032:44): avc: denied { recv } for pid=12419 comm="syz-executor.6" saddr=172.20.20.187 src=20003 daddr=172.20.20.10 dest=56412 netif=lo scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:policy_src_t:s0 tclass=peer permissive=1