====================================================== WARNING: possible circular locking dependency detected 4.14.156-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/30621 is trying to acquire lock: (&mm->mmap_sem){++++}, at: [<00000000bec60d5d>] __do_page_fault+0x8a4/0xbb0 arch/x86/mm/fault.c:1356 but task is already holding lock: (&sb->s_type->i_mutex_key#10){+.+.}, at: [<000000005640000e>] inode_lock include/linux/fs.h:724 [inline] (&sb->s_type->i_mutex_key#10){+.+.}, at: [<000000005640000e>] generic_file_write_iter+0x99/0x650 mm/filemap.c:3283 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&sb->s_type->i_mutex_key#10){+.+.}: down_write+0x34/0x90 kernel/locking/rwsem.c:54 inode_lock include/linux/fs.h:724 [inline] shmem_fallocate+0x150/0xae0 mm/shmem.c:2904 ashmem_shrink_scan drivers/staging/android/ashmem.c:453 [inline] ashmem_shrink_scan+0x1ca/0x4f0 drivers/staging/android/ashmem.c:437 ashmem_ioctl+0x2b4/0xd20 drivers/staging/android/ashmem.c:795 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #1 (ashmem_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xf7/0x13e0 kernel/locking/mutex.c:893 ashmem_mmap+0x4c/0x450 drivers/staging/android/ashmem.c:369 call_mmap include/linux/fs.h:1803 [inline] mmap_region+0x7d9/0xfb0 mm/mmap.c:1736 do_mmap+0x548/0xb80 mm/mmap.c:1512 do_mmap_pgoff include/linux/mm.h:2215 [inline] vm_mmap_pgoff+0x177/0x1c0 mm/util.c:333 SYSC_mmap_pgoff mm/mmap.c:1564 [inline] SyS_mmap_pgoff+0xf4/0x1b0 mm/mmap.c:1520 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #0 (&mm->mmap_sem){++++}: lock_acquire+0x12b/0x360 kernel/locking/lockdep.c:3994 down_read+0x37/0xa0 kernel/locking/rwsem.c:24 __do_page_fault+0x8a4/0xbb0 arch/x86/mm/fault.c:1356 page_fault+0x22/0x50 arch/x86/entry/entry_64.S:1122 fault_in_pages_readable include/linux/pagemap.h:614 [inline] iov_iter_fault_in_readable+0x29c/0x350 lib/iov_iter.c:421 generic_perform_write+0x158/0x460 mm/filemap.c:3123 __generic_file_write_iter+0x32e/0x550 mm/filemap.c:3258 generic_file_write_iter+0x36f/0x650 mm/filemap.c:3286 call_write_iter include/linux/fs.h:1798 [inline] new_sync_write fs/read_write.c:471 [inline] __vfs_write+0x401/0x5a0 fs/read_write.c:484 vfs_write+0x17f/0x4d0 fs/read_write.c:546 SYSC_pwrite64 fs/read_write.c:636 [inline] SyS_pwrite64+0x136/0x160 fs/read_write.c:623 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 other info that might help us debug this: Chain exists of: &mm->mmap_sem --> ashmem_mutex --> &sb->s_type->i_mutex_key#10 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.4/30621: #0: (sb_writers#6){.+.+}, at: [<000000000bcfce06>] file_start_write include/linux/fs.h:2746 [inline] #0: (sb_writers#6){.+.+}, at: [<000000000bcfce06>] vfs_write+0x3d8/0x4d0 fs/read_write.c:545 #1: (&sb->s_type->i_mutex_key#10){+.+.}, at: [<000000005640000e>] inode_lock include/linux/fs.h:724 [inline] #1: (&sb->s_type->i_mutex_key#10){+.+.}, at: [<000000005640000e>] generic_file_write_iter+0x99/0x650 mm/filemap.c:3283 stack backtrace: CPU: 0 PID: 30621 Comm: syz-executor.4 Not tainted 4.14.156-syzkaller #0 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xe5/0x154 lib/dump_stack.c:58 print_circular_bug.isra.0.cold+0x2dc/0x425 kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1901 [inline] check_prevs_add kernel/locking/lockdep.c:2018 [inline] validate_chain kernel/locking/lockdep.c:2460 [inline] __lock_acquire+0x2f5f/0x4320 kernel/locking/lockdep.c:3487 lock_acquire+0x12b/0x360 kernel/locking/lockdep.c:3994 down_read+0x37/0xa0 kernel/locking/rwsem.c:24 __do_page_fault+0x8a4/0xbb0 arch/x86/mm/fault.c:1356 page_fault+0x22/0x50 arch/x86/entry/entry_64.S:1122 RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:614 [inline] RIP: 0010:iov_iter_fault_in_readable+0x29c/0x350 lib/iov_iter.c:421 RSP: 0018:ffff8881a09e7a90 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 000000000000007f RCX: 0000000000040000 RDX: ffffffff81bad7e6 RSI: ffffc9000c16f000 RDI: ffff8881a09e7d20 RBP: 1ffff1103413cf53 R08: 0000000000001000 R09: fffff94000d82884 R10: fffff94000d82883 R11: ffffea0006c1441f R12: 0000000000001000 R13: 0000000000000000 R14: 00000000204f91bf R15: ffff8881a09e7d18 generic_perform_write+0x158/0x460 mm/filemap.c:3123 __generic_file_write_iter+0x32e/0x550 mm/filemap.c:3258 generic_file_write_iter+0x36f/0x650 mm/filemap.c:3286 call_write_iter include/linux/fs.h:1798 [inline] new_sync_write fs/read_write.c:471 [inline] __vfs_write+0x401/0x5a0 fs/read_write.c:484 vfs_write+0x17f/0x4d0 fs/read_write.c:546 SYSC_pwrite64 fs/read_write.c:636 [inline] SyS_pwrite64+0x136/0x160 fs/read_write.c:623 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x414437 RSP: 002b:00007f51caeeaa80 EFLAGS: 00000293 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00000000200002a8 RCX: 0000000000414437 RDX: 0000000008100000 RSI: 00000000200001c0 RDI: 0000000000000007 RBP: 0000000000000011 R08: fe03f80fe03f80ff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000007 R13: 00000000004ca07f R14: 00000000004e2010 R15: 00000000ffffffff EXT4-fs (loop4): bad geometry: block count 580964351930795064 exceeds size of device (66048 blocks) audit: type=1400 audit(2000000098.910:202): avc: denied { associate } for pid=30695 comm="syz-executor.3" name="/" dev="devtmpfs" ino=1025 scontext=system_u:object_r:setfiles_exec_t:s0 tcontext=system_u:object_r:device_t:s0 tclass=filesystem permissive=1 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:1261: comm syz-executor.4: bad orphan inode 63 ext4_test_bit(bit=62, block=6) = 0 EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): Unrecognized mount option "" or missing value EXT4-fs (loop4): failed to parse options in superblock:  EXT4-fs (loop4): bad geometry: block count 580964351930795064 exceeds size of device (66048 blocks) EXT4-fs (loop4): VFS: Can't find ext4 filesystem 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:1261: comm syz-executor.4: bad orphan inode 63 ext4_test_bit(bit=62, block=4) = 0 EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock EXT4-fs (loop4): ext4_check_descriptors: Inode bitmap for group 0 overlaps superblock 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_read_inode_bitmap:140: comm syz-executor.4: Invalid inode bitmap blk 0 in block_group 0 audit: type=1400 audit(2000000100.360:203): avc: denied { relabelto } for pid=30982 comm="syz-executor.1" name="/" dev="devtmpfs" ino=1025 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:devtty_t:s0 tclass=dir permissive=1 EXT4-fs error (device loop4): ext4_orphan_get:1225: comm syz-executor.4: inode bitmap error 63 for orphan 18446744073709551499 EXT4-fs (loop4): 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:1261: comm syz-executor.4: bad orphan inode 63 ext4_test_bit(bit=62, block=6) = 0 EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): ext4_check_descriptors: Inode table for group 0 overlaps superblock EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): ext4_check_descriptors: Inode table for group 0 overlaps superblock EXT4-fs: failed to create workqueue EXT4-fs (loop4): mount failed EXT4-fs (loop4): VFS: Can't find ext4 filesystem 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:1261: comm syz-executor.4: bad orphan inode 63 ext4_test_bit(bit=62, block=6) = 0 EXT4-fs (loop4): 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:1261: comm syz-executor.4: bad orphan inode 63 ext4_test_bit(bit=62, block=6) = 0 EXT4-fs (loop4): 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:1261: comm syz-executor.4: bad orphan inode 63 ext4_test_bit(bit=62, block=6) = 0 EXT4-fs (loop4): 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:1261: comm syz-executor.4: bad orphan inode 63 ext4_test_bit(bit=62, block=4) = 0 EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): Unrecognized mount option "sy" or missing value EXT4-fs (loop4): failed to parse options in superblock: sy EXT4-fs (loop4): ext4_check_descriptors: Inode table for group 0 overlaps superblock [EXT4 FS bs=2048, gc=1, bpg=16384, ipg=128, mo=a8006018, mo2=0002] System zones: 0-7, 5-6 EXT4-fs (loop4): orphan cleanup on readonly fs EXT4-fs error (device loop4): ext4_orphan_get:1261: comm syz-executor.4: bad orphan inode 63 ext4_test_bit(bit=62, block=6) = 0 EXT4-fs (loop4): mounted filesystem without journal. Opts: sy; ,errors=continue EXT4-fs (loop4): Unrecognized mount option "sy" or missing value EXT4-fs (loop4): failed to parse options in superblock: sy EXT4-fs (loop4): ext4_check_descriptors: Inode table for group 0 overlaps superblock EXT4-fs: failed to create workqueue EXT4-fs (loop4): mount failed EXT4-fs (loop4): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock EXT4-fs (loop4): ext4_check_descriptors: Inode bitmap for group 0 overlaps superblock 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_read_inode_bitmap:140: comm syz-executor.4: Invalid inode bitmap blk 0 in block_group 0 EXT4-fs error (device loop4): ext4_orphan_get:1225: comm syz-executor.4: inode bitmap error 63 for orphan 18446744073709551499 EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): bad geometry: block count 580964351930795064 exceeds size of device (66048 blocks) EXT4-fs (loop4): bad geometry: block count 1080 exceeds size of device (1 blocks) 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:1261: comm syz-executor.4: bad orphan inode 63 ext4_test_bit(bit=62, block=4) = 0 EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): ext4_check_descriptors: Inode table for group 0 overlaps superblock [EXT4 FS bs=2048, gc=1, bpg=16384, ipg=128, mo=a8024018, mo2=0002] System zones: 0-7, 3-4 EXT4-fs (loop4): orphan cleanup on readonly fs EXT4-fs error (device loop4): ext4_orphan_get:1261: comm syz-executor.4: bad orphan inode 63 ext4_test_bit(bit=62, block=4) = 0 EXT4-fs (loop4): 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:1261: comm syz-executor.4: bad orphan inode 63 ext4_test_bit(bit=62, block=4) = 0 EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): bad geometry: block count 1080 exceeds size of device (1 blocks) audit: type=1400 audit(2000000106.150:204): avc: denied { map } for pid=31833 comm="syz-executor.5" path="socket:[321213]" dev="sockfs" ino=321213 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=udp_socket permissive=1 EXT4-fs (loop4): bad geometry: block count 1080 exceeds size of device (1 blocks) EXT4-fs (loop4): Unrecognized mount option "8" or missing value EXT4-fs (loop4): failed to parse options in superblock: 8 EXT4-fs (loop4): ext4_check_descriptors: Inode table for group 0 overlaps superblock [EXT4 FS bs=2048, gc=1, bpg=16384, ipg=128, mo=e000601c, mo2=0002] System zones: 0-7, 3-4 EXT4-fs (loop4): orphan cleanup on readonly fs EXT4-fs error (device loop4): ext4_orphan_get:1261: comm syz-executor.4: bad orphan inode 1082138482 EXT4-fs (loop4): mounted filesystem without journal. Opts: 8; ,errors=continue