======================================================
[ INFO: possible circular locking dependency detected ]
4.9.203-syzkaller #0 Not tainted
-------------------------------------------------------
syz-executor.4/3310 is trying to acquire lock:
(&mm->mmap_sem){++++++}, at: [<00000000fddb4ce6>] __do_page_fault+0x7bd/0xa60 arch/x86/mm/fault.c:1337
but task is already holding lock:
(&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<000000005e3638c1>] inode_lock include/linux/fs.h:771 [inline]
(&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<000000005e3638c1>] generic_file_write_iter+0x9a/0x630 mm/filemap.c:3090
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
lock_acquire+0x133/0x3d0 kernel/locking/lockdep.c:3759
down_write+0x41/0xa0 kernel/locking/rwsem.c:52
inode_lock include/linux/fs.h:771 [inline]
shmem_fallocate+0x143/0xab0 mm/shmem.c:2683
ashmem_shrink_scan drivers/staging/android/ashmem.c:462 [inline]
ashmem_shrink_scan+0x1c3/0x4c0 drivers/staging/android/ashmem.c:446
ashmem_ioctl+0x29b/0xdd0 drivers/staging/android/ashmem.c:804
vfs_ioctl fs/ioctl.c:43 [inline]
file_ioctl fs/ioctl.c:493 [inline]
do_vfs_ioctl+0xb87/0x11d0 fs/ioctl.c:677
SYSC_ioctl fs/ioctl.c:694 [inline]
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
entry_SYSCALL_64_after_swapgs+0x5d/0xdb
lock_acquire+0x133/0x3d0 kernel/locking/lockdep.c:3759
__mutex_lock_common kernel/locking/mutex.c:521 [inline]
mutex_lock_nested+0xc7/0x920 kernel/locking/mutex.c:621
ashmem_mmap+0x53/0x470 drivers/staging/android/ashmem.c:378
mmap_region+0x7e7/0xfa0 mm/mmap.c:1726
do_mmap+0x539/0xbc0 mm/mmap.c:1505
do_mmap_pgoff include/linux/mm.h:2066 [inline]
vm_mmap_pgoff+0x179/0x1c0 mm/util.c:329
SYSC_mmap_pgoff mm/mmap.c:1555 [inline]
SyS_mmap_pgoff+0xfa/0x1b0 mm/mmap.c:1513
SYSC_mmap arch/x86/kernel/sys_x86_64.c:96 [inline]
SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:87
do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
entry_SYSCALL_64_after_swapgs+0x5d/0xdb
check_prev_add kernel/locking/lockdep.c:1828 [inline]
check_prevs_add kernel/locking/lockdep.c:1938 [inline]
validate_chain kernel/locking/lockdep.c:2265 [inline]
__lock_acquire+0x2d22/0x4390 kernel/locking/lockdep.c:3345
lock_acquire+0x133/0x3d0 kernel/locking/lockdep.c:3759
down_read+0x44/0xb0 kernel/locking/rwsem.c:22
__do_page_fault+0x7bd/0xa60 arch/x86/mm/fault.c:1337
do_page_fault+0x28/0x30 arch/x86/mm/fault.c:1464
page_fault+0x25/0x30 arch/x86/entry/entry_64.S:956
generic_perform_write+0x1b6/0x500 mm/filemap.c:2930
__generic_file_write_iter+0x340/0x530 mm/filemap.c:3065
generic_file_write_iter+0x38a/0x630 mm/filemap.c:3093
new_sync_write fs/read_write.c:498 [inline]
__vfs_write+0x3c1/0x560 fs/read_write.c:511
vfs_write+0x185/0x520 fs/read_write.c:559
SYSC_pwrite64 fs/read_write.c:649 [inline]
SyS_pwrite64+0x13f/0x170 fs/read_write.c:636
do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
entry_SYSCALL_64_after_swapgs+0x5d/0xdb
other info that might help us debug this:
Chain exists of:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&sb->s_type->i_mutex_key#10);
lock(ashmem_mutex);
lock(&sb->s_type->i_mutex_key#10);
lock(&mm->mmap_sem);
*** DEADLOCK ***
2 locks held by syz-executor.4/3310:
#0: (sb_writers#6){.+.+.+}, at: [<000000000465c2f9>] file_start_write include/linux/fs.h:2645 [inline]
#0: (sb_writers#6){.+.+.+}, at: [<000000000465c2f9>] vfs_write+0x3e9/0x520 fs/read_write.c:558
#1: (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<000000005e3638c1>] inode_lock include/linux/fs.h:771 [inline]
#1: (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<000000005e3638c1>] generic_file_write_iter+0x9a/0x630 mm/filemap.c:3090
stack backtrace:
CPU: 1 PID: 3310 Comm: syz-executor.4 Not tainted 4.9.203-syzkaller #0
ffff8801a94c75e8 ffffffff81b55f6b ffffffff83caeb80 ffffffff83cb8000
ffffffff83cf9b50 ffffffff8424ff40 ffff8801c83a2f80 ffff8801a94c7640
ffffffff81406eaa dffffc0000000000 ffffffff8407bb40 ffff8801c83a3880
Call Trace:
[<0000000013083290>] __dump_stack lib/dump_stack.c:15 [inline]
[<0000000013083290>] dump_stack+0xcb/0x130 lib/dump_stack.c:56
[<00000000d21275e1>] print_circular_bug.cold+0x2f6/0x454 kernel/locking/lockdep.c:1202
[<00000000dbced3f4>] check_prev_add kernel/locking/lockdep.c:1828 [inline]
[<00000000dbced3f4>] check_prevs_add kernel/locking/lockdep.c:1938 [inline]
[<00000000dbced3f4>] validate_chain kernel/locking/lockdep.c:2265 [inline]
[<00000000dbced3f4>] __lock_acquire+0x2d22/0x4390 kernel/locking/lockdep.c:3345
[<00000000d197f60f>] lock_acquire+0x133/0x3d0 kernel/locking/lockdep.c:3759
[<0000000055a47bff>] down_read+0x44/0xb0 kernel/locking/rwsem.c:22
[<00000000fddb4ce6>] __do_page_fault+0x7bd/0xa60 arch/x86/mm/fault.c:1337
[<00000000b7502292>] do_page_fault+0x28/0x30 arch/x86/mm/fault.c:1464
[<000000006751b43f>] page_fault+0x25/0x30 arch/x86/entry/entry_64.S:956
[<0000000014060bf4>] generic_perform_write+0x1b6/0x500 mm/filemap.c:2930
[<0000000083e1d319>] __generic_file_write_iter+0x340/0x530 mm/filemap.c:3065
[<00000000283d6677>] generic_file_write_iter+0x38a/0x630 mm/filemap.c:3093
[<00000000b21db72f>] new_sync_write fs/read_write.c:498 [inline]
[<00000000b21db72f>] __vfs_write+0x3c1/0x560 fs/read_write.c:511
[<00000000c9e334fb>] vfs_write+0x185/0x520 fs/read_write.c:559
[<00000000eddfb2f0>] SYSC_pwrite64 fs/read_write.c:649 [inline]
[<00000000eddfb2f0>] SyS_pwrite64+0x13f/0x170 fs/read_write.c:636
[<000000003f2cd68a>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
[<00000000b2ff86fd>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
netlink: 48 bytes leftover after parsing attributes in process `syz-executor.2'.
EXT4-fs (loop3): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock
EXT4-fs (loop3): ext4_check_descriptors: Inode bitmap for group 0 overlaps superblock
EXT4-fs (loop3): ext4_check_descriptors: Inode table for group 0 overlaps superblock
EXT4-fs (loop3): orphan cleanup on readonly fs
EXT4-fs error (device loop3): ext4_orphan_get:1184: comm syz-executor.3: bad orphan inode 1
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop1): ext4_check_descriptors: Inode table for group 0 overlaps superblock
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
EXT4-fs (loop1): orphan cleanup on readonly fs
EXT4-fs error (device loop1): ext4_orphan_get:1184: comm syz-executor.1: bad orphan inode 1
EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
EXT4-fs (loop1): ext4_check_descriptors: Inode table for group 0 overlaps superblock
EXT4-fs (loop1): orphan cleanup on readonly fs
EXT4-fs (loop3): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock
EXT4-fs (loop3): ext4_check_descriptors: Inode bitmap for group 0 overlaps superblock
EXT4-fs (loop3): ext4_check_descriptors: Inode table for group 0 overlaps superblock
EXT4-fs (loop3): orphan cleanup on readonly fs
EXT4-fs error (device loop3): ext4_orphan_get:1184: comm syz-executor.3: bad orphan inode 1
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop4): ext4_check_descriptors: Inode table for group 0 overlaps superblock
EXT4-fs (loop4): orphan cleanup on readonly fs
EXT4-fs error (device loop4): ext4_orphan_get:1184: comm syz-executor.4: bad orphan inode 1
EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs error (device loop1): ext4_orphan_get:1184: comm syz-executor.1: bad orphan inode 1
EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 48 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 48 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
EXT4-fs (loop3): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock
EXT4-fs (loop1): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock
EXT4-fs (loop1): ext4_check_descriptors: Inode bitmap for group 0 overlaps superblock
EXT4-fs (loop1): ext4_check_descriptors: Inode table for group 0 overlaps superblock
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
EXT4-fs (loop1): orphan cleanup on readonly fs
EXT4-fs error (device loop1): ext4_orphan_get:1184: comm syz-executor.1: bad orphan inode 1
EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
EXT4-fs (loop4): ext4_check_descriptors: Inode table for group 0 overlaps superblock
EXT4-fs (loop4): orphan cleanup on readonly fs
EXT4-fs error (device loop4): ext4_orphan_get:1184: comm syz-executor.4: bad orphan inode 1
EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue
SELinux: unrecognized netlink message: protocol=6 nlmsg_type=56607 sclass=netlink_xfrm_socket pig=3517 comm=syz-executor.2
SELinux: unrecognized netlink message: protocol=6 nlmsg_type=56607 sclass=netlink_xfrm_socket pig=3518 comm=syz-executor.2
EXT4-fs (loop3): ext4_check_descriptors: Inode bitmap for group 0 overlaps superblock
EXT4-fs (loop3): ext4_check_descriptors: Inode table for group 0 overlaps superblock
EXT4-fs (loop3): orphan cleanup on readonly fs
EXT4-fs error (device loop3): ext4_orphan_get:1184: comm syz-executor.3: bad orphan inode 1
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop3): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock
EXT4-fs (loop3): ext4_check_descriptors: Inode bitmap for group 0 overlaps superblock
EXT4-fs (loop3): ext4_check_descriptors: Inode table for group 0 overlaps superblock
EXT4-fs (loop1): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock
EXT4-fs (loop3): orphan cleanup on readonly fs
EXT4-fs error (device loop3): ext4_orphan_get:1184: comm syz-executor.3: bad orphan inode 1
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop1): ext4_check_descriptors: Inode bitmap for group 0 overlaps superblock
EXT4-fs (loop1): ext4_check_descriptors: Inode table for group 0 overlaps superblock
EXT4-fs (loop4): ext4_check_descriptors: Inode table for group 0 overlaps superblock
EXT4-fs (loop1): orphan cleanup on readonly fs
EXT4-fs error (device loop1): ext4_orphan_get:1184: comm syz-executor.1: bad orphan inode 1
EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop4): orphan cleanup on readonly fs
EXT4-fs error (device loop4): ext4_orphan_get:1184: comm syz-executor.4: bad orphan inode 1
EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue
netlink: 48 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 48 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
SELinux: unrecognized netlink message: protocol=6 nlmsg_type=8704 sclass=netlink_xfrm_socket pig=3607 comm=syz-executor.2
SELinux: unrecognized netlink message: protocol=6 nlmsg_type=8704 sclass=netlink_xfrm_socket pig=3629 comm=syz-executor.2
EXT4-fs (loop4): ext4_check_descriptors: Inode table for group 0 overlaps superblock
EXT4-fs (loop3): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock
EXT4-fs (loop3): ext4_check_descriptors: Inode bitmap for group 0 overlaps superblock
EXT4-fs (loop3): ext4_check_descriptors: Inode table for group 0 overlaps superblock
EXT4-fs (loop1): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock
EXT4-fs (loop1): ext4_check_descriptors: Inode bitmap for group 0 overlaps superblock
EXT4-fs (loop1): ext4_check_descriptors: Inode table for group 0 overlaps superblock
EXT4-fs (loop4): orphan cleanup on readonly fs
EXT4-fs error (device loop4): ext4_orphan_get:1184: comm syz-executor.4: bad orphan inode 1
[EXT4 FS bs=2048, gc=1, bpg=16384, ipg=128, mo=a0024018, mo2=0002]
System zones: 0-7
EXT4-fs (loop3): orphan cleanup on readonly fs
EXT4-fs error (device loop3): ext4_orphan_get:1184: comm syz-executor.3: bad orphan inode 1
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop1): orphan cleanup on readonly fs
EXT4-fs error (device loop1): ext4_orphan_get:1184: comm syz-executor.1: bad orphan inode 1
EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop4): bad geometry: block count 1080 exceeds size of device (512 blocks)
EXT4-fs (loop3): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock
EXT4-fs (loop3): ext4_check_descriptors: Inode bitmap for group 0 overlaps superblock
EXT4-fs (loop3): ext4_check_descriptors: Inode table for group 0 overlaps superblock
EXT4-fs (loop3): orphan cleanup on readonly fs
EXT4-fs error (device loop3): ext4_orphan_get:1184: comm syz-executor.3: bad orphan inode 1
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs (loop4): bad geometry: block count 1080 exceeds size of device (512 blocks)
EXT4-fs (loop3): Unrecognized mount option "�" or missing value
EXT4-fs (loop3): failed to parse options in superblock: �
EXT4-fs (loop3): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock
EXT4-fs (loop3): ext4_check_descriptors: Inode bitmap for group 0 overlaps superblock
EXT4-fs (loop3): ext4_check_descriptors: Inode table for group 0 overlaps superblock
EXT4-fs (loop3): orphan cleanup on readonly fs
EXT4-fs error (device loop3): ext4_orphan_get:1184: comm syz-executor.3: bad orphan inode 1
EXT4-fs (loop3): mounted filesystem without journal. Opts: �; ,errors=continue
nla_parse: 10 callbacks suppressed
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
EXT4-fs (loop3): bad geometry: block count 580964351930795064 exceeds size of device (66048 blocks)
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
EXT4-fs (loop4): bad geometry: block count 580964351930795064 exceeds size of device (66048 blocks)
netlink: 48 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 48 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
EXT4-fs (loop3): Unrecognized mount option "TI�" or missing value
EXT4-fs (loop3): failed to parse options in superblock: TI�
EXT4-fs (loop3): bad geometry: block count 580964351930795064 exceeds size of device (66048 blocks)
SELinux: unrecognized netlink message: protocol=6 nlmsg_type=11 sclass=netlink_xfrm_socket pig=3838 comm=syz-executor.2
EXT4-fs (loop3): VFS: Can't find ext4 filesystem