REISERFS (device loop3): Using r5 hash to sort names
REISERFS (device loop3): Created .reiserfs_priv - reserved for xattr storage.
======================================================
WARNING: possible circular locking dependency detected
4.14.302-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.3/10737 is trying to acquire lock:
 (sb_writers#18){.+.+}, at: [<ffffffff818e216d>] sb_start_write include/linux/fs.h:1551 [inline]
 (sb_writers#18){.+.+}, at: [<ffffffff818e216d>] mnt_want_write_file+0xfd/0x3b0 fs/namespace.c:497

but task is already holding lock:
 (&sbi->lock){+.+.}, at: [<ffffffff81b3fca5>] reiserfs_write_lock+0x75/0xf0 fs/reiserfs/lock.c:27

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&sbi->lock){+.+.}:
       __mutex_lock_common kernel/locking/mutex.c:756 [inline]
       __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
       reiserfs_write_lock+0x75/0xf0 fs/reiserfs/lock.c:27
       reiserfs_dirty_inode+0xa8/0x200 fs/reiserfs/super.c:710
       __mark_inode_dirty+0x11e/0xf40 fs/fs-writeback.c:2134
       generic_update_time+0x1b0/0x270 fs/inode.c:1657
       update_time fs/inode.c:1673 [inline]
       touch_atime+0x1ed/0x250 fs/inode.c:1745
       file_accessed include/linux/fs.h:2077 [inline]
       iterate_dir+0x4c5/0x5e0 fs/readdir.c:57
       SYSC_getdents64 fs/readdir.c:358 [inline]
       SyS_getdents64+0x125/0x230 fs/readdir.c:339
       do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x5e/0xd3

-> #0 (sb_writers#18){.+.+}:
       lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
       percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline]
       percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
       __sb_start_write+0x64/0x260 fs/super.c:1342
       sb_start_write include/linux/fs.h:1551 [inline]
       mnt_want_write_file+0xfd/0x3b0 fs/namespace.c:497
       reiserfs_ioctl+0x18e/0x8b0 fs/reiserfs/ioctl.c:110
       vfs_ioctl fs/ioctl.c:46 [inline]
       file_ioctl fs/ioctl.c:500 [inline]
       do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
       SYSC_ioctl fs/ioctl.c:701 [inline]
       SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
       do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x5e/0xd3

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&sbi->lock);
                               lock(sb_writers#18);
                               lock(&sbi->lock);
  lock(sb_writers#18);

 *** DEADLOCK ***

1 lock held by syz-executor.3/10737:
 #0:  (&sbi->lock){+.+.}, at: [<ffffffff81b3fca5>] reiserfs_write_lock+0x75/0xf0 fs/reiserfs/lock.c:27

stack backtrace:
CPU: 0 PID: 10737 Comm: syz-executor.3 Not tainted 4.14.302-syzkaller #0
NILFS (loop5): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258
 check_prev_add kernel/locking/lockdep.c:1905 [inline]
 check_prevs_add kernel/locking/lockdep.c:2022 [inline]
 validate_chain kernel/locking/lockdep.c:2464 [inline]
 __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491
 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline]
 percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
 __sb_start_write+0x64/0x260 fs/super.c:1342
 sb_start_write include/linux/fs.h:1551 [inline]
 mnt_want_write_file+0xfd/0x3b0 fs/namespace.c:497
 reiserfs_ioctl+0x18e/0x8b0 fs/reiserfs/ioctl.c:110
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fccce8770d9
RSP: 002b:00007fccccde9168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fccce996f80 RCX: 00007fccce8770d9
RDX: 00000000200000c0 RSI: 0000000040087602 RDI: 0000000000000005
RBP: 00007fccce8d2ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc5ccbab5f R14: 00007fccccde9300 R15: 0000000000022000
EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue
Quota error (device loop4): find_block_dqentry: Quota for id 0 referenced but not present
Quota error (device loop4): qtree_read_dquot: Can't read quota structure for id 0
REISERFS (device loop3): found reiserfs format "3.6" with non-standard journal
REISERFS (device loop3): using ordered data mode
reiserfs: using flush barriers
NILFS (loop5): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
REISERFS (device loop3): journal params: device loop3, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop3): checking transaction log (loop3)
EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue
REISERFS (device loop3): Using r5 hash to sort names
REISERFS (device loop3): Created .reiserfs_priv - reserved for xattr storage.
befs: (loop5): No write support. Marking filesystem read-only
befs: (loop5): invalid magic header
REISERFS (device loop3): found reiserfs format "3.6" with non-standard journal
REISERFS (device loop3): using ordered data mode
reiserfs: using flush barriers
REISERFS (device loop3): journal params: device loop3, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop3): checking transaction log (loop3)
REISERFS (device loop3): Using r5 hash to sort names
REISERFS (device loop3): Created .reiserfs_priv - reserved for xattr storage.
print_req_error: I/O error, dev loop0, sector 0
input: syz1 as /devices/virtual/input/input5
REISERFS (device loop3): found reiserfs format "3.6" with non-standard journal
REISERFS (device loop3): using ordered data mode
reiserfs: using flush barriers
REISERFS (device loop3): journal params: device loop3, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop3): checking transaction log (loop3)
REISERFS (device loop3): Using r5 hash to sort names
REISERFS (device loop3): Created .reiserfs_priv - reserved for xattr storage.
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'.
print_req_error: I/O error, dev loop0, sector 0
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'.
caif:caif_disconnect_client(): nothing to disconnect
caif:caif_disconnect_client(): nothing to disconnect
input: syz1 as /devices/virtual/input/input6
input: syz1 as /devices/virtual/input/input7
caif:caif_disconnect_client(): nothing to disconnect
caif:caif_disconnect_client(): nothing to disconnect
caif:caif_disconnect_client(): nothing to disconnect
caif:caif_disconnect_client(): nothing to disconnect
caif:caif_disconnect_client(): nothing to disconnect
input: syz1 as /devices/virtual/input/input8
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'.
input: syz1 as /devices/virtual/input/input9
input: syz1 as /devices/virtual/input/input10
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'.
input: syz1 as /devices/virtual/input/input11
input: syz1 as /devices/virtual/input/input12
ubi0: attaching mtd0
input: syz1 as /devices/virtual/input/input13
ubi0: scanning is finished
ubi0: empty MTD device detected
ubi0: attached mtd0 (name "mtdram test device", size 0 MiB)
ubi0: PEB size: 4096 bytes (4 KiB), LEB size: 3968 bytes
ubi0: min./max. I/O unit sizes: 1/64, sub-page size 1
ubi0: VID header offset: 64 (aligned 64), data offset: 128
ubi0: good PEBs: 32, bad PEBs: 0, corrupted PEBs: 0
ubi0: user volume: 0, internal volumes: 1, max. volumes count: 23
ubi0: max/mean erase counter: 0/0, WL threshold: 4096, image sequence number: 2534221743
ubi0: available PEBs: 28, total reserved PEBs: 4, PEBs reserved for bad PEB handling: 0
ubi0: background thread "ubi_bgt0d" started, PID 11212
ubi0: detaching mtd0
ubi0: mtd0 is detached
ubi0: attaching mtd0
ubi0: scanning is finished
input: syz1 as /devices/virtual/input/input14
ubi0: attached mtd0 (name "mtdram test device", size 0 MiB)
ubi0: PEB size: 4096 bytes (4 KiB), LEB size: 3968 bytes
IPVS: ftp: loaded support on port[0] = 21
ubi0: min./max. I/O unit sizes: 1/64, sub-page size 1
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
ubi0: VID header offset: 64 (aligned 64), data offset: 128
ubi0: good PEBs: 32, bad PEBs: 0, corrupted PEBs: 0
ubi0: user volume: 0, internal volumes: 1, max. volumes count: 23
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
ubi0: max/mean erase counter: 1/1, WL threshold: 4096, image sequence number: 2534221743
ubi0: available PEBs: 28, total reserved PEBs: 4, PEBs reserved for bad PEB handling: 0
ubi0: background thread "ubi_bgt0d" started, PID 11265
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
ubi: mtd0 is already attached to ubi0
ubi0: detaching mtd0
ubi0: mtd0 is detached
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
ubi0: attaching mtd0
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
ubi0: scanning is finished
device lo entered promiscuous mode
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
ubi0: attached mtd0 (name "mtdram test device", size 0 MiB)
ubi0: PEB size: 4096 bytes (4 KiB), LEB size: 3968 bytes
ubi0: min./max. I/O unit sizes: 1/64, sub-page size 1
ubi0: VID header offset: 64 (aligned 64), data offset: 128
device lo left promiscuous mode
ubi0: good PEBs: 32, bad PEBs: 0, corrupted PEBs: 0
ubi0: user volume: 0, internal volumes: 1, max. volumes count: 23
ubi0: max/mean erase counter: 2/1, WL threshold: 4096, image sequence number: 2534221743
ubi0: available PEBs: 28, total reserved PEBs: 4, PEBs reserved for bad PEB handling: 0
ubi0: background thread "ubi_bgt0d" started, PID 11352
ubi: mtd0 is already attached to ubi0
ubi0: detaching mtd0
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
ubi0: mtd0 is detached
device lo entered promiscuous mode
ubi0: attaching mtd0
ubi0: scanning is finished
device lo left promiscuous mode
ubi0: attached mtd0 (name "mtdram test device", size 0 MiB)
device lo entered promiscuous mode
ubi0: PEB size: 4096 bytes (4 KiB), LEB size: 3968 bytes
ubi0: min./max. I/O unit sizes: 1/64, sub-page size 1
ubi0: VID header offset: 64 (aligned 64), data offset: 128
ubi0: good PEBs: 32, bad PEBs: 0, corrupted PEBs: 0
ubi0: user volume: 0, internal volumes: 1, max. volumes count: 23
ubi0: max/mean erase counter: 2/1, WL threshold: 4096, image sequence number: 2534221743
ubi0: available PEBs: 28, total reserved PEBs: 4, PEBs reserved for bad PEB handling: 0
ubi: mtd0 is already attached to ubi0
ubi0: background thread "ubi_bgt0d" started, PID 11386
ubi0: detaching mtd0
ubi0: mtd0 is detached
device lo left promiscuous mode
device lo entered promiscuous mode
kvm: vcpu 0: requested 128 ns lapic timer period limited to 500000 ns
usb usb9: usbfs: interface 0 claimed by hub while 'syz-executor.2' sets config #0
netlink: 64 bytes leftover after parsing attributes in process `syz-executor.5'.
kvm: vcpu 0: requested 128 ns lapic timer period limited to 500000 ns
usb usb9: usbfs: interface 0 claimed by usbfs while 'syz-executor.2' sets config #1
kauditd_printk_skb: 2 callbacks suppressed
audit: type=1800 audit(1671571684.164:26): pid=11445 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="bus" dev="loop5" ino=9 res=0
audit: type=1804 audit(1671571684.184:27): pid=11445 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir320455962/syzkaller.YTBQKb/51/file0/bus" dev="loop5" ino=9 res=1
audit: type=1804 audit(1671571684.184:28): pid=11445 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.5" name="/root/syzkaller-testdir320455962/syzkaller.YTBQKb/51/file0/bus" dev="loop5" ino=9 res=1
audit: type=1804 audit(1671571684.184:29): pid=11445 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir320455962/syzkaller.YTBQKb/51/file0/bus" dev="loop5" ino=9 res=1
netlink: 64 bytes leftover after parsing attributes in process `syz-executor.5'.
hub 9-0:1.0: USB hub found
kvm: vcpu 0: requested 128 ns lapic timer period limited to 500000 ns
hub 9-0:1.0: 8 ports detected
audit: type=1800 audit(1671571684.644:30): pid=11486 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="bus" dev="loop5" ino=10 res=0
netlink: 64 bytes leftover after parsing attributes in process `syz-executor.5'.
audit: type=1804 audit(1671571684.664:31): pid=11486 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir320455962/syzkaller.YTBQKb/52/file0/bus" dev="loop5" ino=10 res=1
audit: type=1804 audit(1671571684.664:32): pid=11486 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.5" name="/root/syzkaller-testdir320455962/syzkaller.YTBQKb/52/file0/bus" dev="loop5" ino=10 res=1
audit: type=1804 audit(1671571684.664:33): pid=11486 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir320455962/syzkaller.YTBQKb/52/file0/bus" dev="loop5" ino=10 res=1
usb usb9: usbfs: interface 0 claimed by hub while 'syz-executor.2' sets config #0
usb usb9: usbfs: interface 0 claimed by usbfs while 'syz-executor.2' sets config #1
kvm: vcpu 0: requested 128 ns lapic timer period limited to 500000 ns
hub 9-0:1.0: USB hub found
hub 9-0:1.0: 8 ports detected