====================================================== WARNING: possible circular locking dependency detected 6.0.0-rc2-next-20220823 #1 Not tainted ------------------------------------------------------ syz-executor.6/28195 is trying to acquire lock: ffff88800ff32170 (&journal->j_barrier){+.+.}-{3:3}, at: jbd2_journal_lock_updates+0x15e/0x310 but task is already holding lock: ffff88800ff30bd0 (&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}: percpu_down_write+0x4d/0x3d0 ext4_ind_migrate+0x237/0x830 ext4_fileattr_set+0x1434/0x18a0 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 -> #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+0x30c7/0x4090 __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.6/28195: #0: ffff88800ff26438 (sb_writers#3){.+.+}-{0:0}, at: do_vfs_ioctl+0xf87/0x1610 #1: ffff88801e18bfa0 (&sb->s_type->i_mutex_key#6){++++}-{3:3}, at: vfs_fileattr_set+0x148/0xb80 #2: ffff88801e18c140 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_change_inode_journal_flag+0x11e/0x530 #3: ffff88800ff30bd0 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_change_inode_journal_flag+0x177/0x530 stack backtrace: CPU: 0 PID: 28195 Comm: syz-executor.6 Not tainted 6.0.0-rc2-next-20220823 #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: 0033:0x7fa1c6942b19 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:00007fa1c3eb8188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa1c6a55f60 RCX: 00007fa1c6942b19 RDX: 0000000020000080 RSI: 0000000040086602 RDI: 0000000000000003 RBP: 00007fa1c699cf6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd05a49e9f R14: 00007fa1c3eb8300 R15: 0000000000022000 kauditd_printk_skb: 180 callbacks suppressed audit: type=1400 audit(1661252258.303:652): avc: denied { setattr } for pid=28180 comm="syz-executor.0" name="smaps" dev="proc" ino=68357 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=file permissive=1 netlink: 468 bytes leftover after parsing attributes in process `syz-executor.7'. netlink: 468 bytes leftover after parsing attributes in process `syz-executor.7'. EXT4-fs warning (device sda): verify_group_input:150: Cannot add at group 0 (only 16 groups) EXT4-fs warning (device sda): verify_group_input:150: Cannot add at group 0 (only 16 groups) netlink: 468 bytes leftover after parsing attributes in process `syz-executor.7'. EXT4-fs warning (device sda): verify_group_input:150: Cannot add at group 0 (only 16 groups) netlink: 468 bytes leftover after parsing attributes in process `syz-executor.7'. EXT4-fs warning (device sda): verify_group_input:150: Cannot add at group 0 (only 16 groups) audit: type=1326 audit(1661252262.914:653): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=29226 comm="syz-executor.6" exe="/syz-executor.6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fa1c6942b19 code=0x0 cgroup: fork rejected by pids controller in /syz7 audit: type=1326 audit(1661252263.718:654): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=29226 comm="syz-executor.6" exe="/syz-executor.6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fa1c6942b19 code=0x0 audit: type=1326 audit(1661252263.935:655): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=29460 comm="syz-executor.6" exe="/syz-executor.6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fa1c6942b19 code=0x0 audit: type=1326 audit(1661252264.862:656): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=29687 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7ff39b31fb19 code=0x0 audit: type=1326 audit(1661252264.926:657): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=29688 comm="syz-executor.3" exe="/syz-executor.3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f97f79e2b19 code=0x0 audit: type=1326 audit(1661252264.963:658): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=29699 comm="syz-executor.6" exe="/syz-executor.6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fa1c6942b19 code=0x0 cgroup: fork rejected by pids controller in /syz1 audit: type=1326 audit(1661252265.265:659): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=30158 comm="syz-executor.5" exe="/syz-executor.5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f2bb5201b19 code=0x0 UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 audit: type=1326 audit(1661252265.853:660): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=30632 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7ff39b31fb19 code=0x0 audit: type=1326 audit(1661252265.992:661): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=30941 comm="syz-executor.3" exe="/syz-executor.3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f97f79e2b19 code=0x0 UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 audit: type=1326 audit(1661252266.916:662): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=30949 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7ff39b31fb19 code=0x0 UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 audit: type=1326 audit(1661252266.953:663): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=30954 comm="syz-executor.3" exe="/syz-executor.3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f97f79e2b19 code=0x0 UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16