EXT4-fs (loop1): mounted filesystem without journal. Opts: bsdgroups,,errors=continue. Quota mode: none.
======================================================
WARNING: possible circular locking dependency detected
5.15.169-syzkaller #0 Not tainted
------------------------------------------------------
syz.1.508/6152 is trying to acquire lock:
ffff8880780f8128 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock+0x1c/0x50 include/linux/mmap_lock.h:117
but task is already holding lock:
ffff8880733e0de8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline]
ffff8880733e0de8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xa0/0x360 fs/ext4/file.c:262
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #6 (&sb->s_type->i_mutex_key#9){++++}-{3:3}:
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498
inode_lock_shared include/linux/fs.h:799 [inline]
ext4_bmap+0x4b/0x410 fs/ext4/inode.c:3163
bmap+0xa1/0xd0 fs/inode.c:1795
jbd2_journal_bmap fs/jbd2/journal.c:981 [inline]
__jbd2_journal_erase fs/jbd2/journal.c:1796 [inline]
jbd2_journal_flush+0x7a2/0xc90 fs/jbd2/journal.c:2502
ext4_ioctl_checkpoint fs/ext4/ioctl.c:849 [inline]
__ext4_ioctl fs/ext4/ioctl.c:1267 [inline]
ext4_ioctl+0x3249/0x5b80 fs/ext4/ioctl.c:1276
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
-> #5 (&journal->j_checkpoint_mutex){+.+.}-{3:3}:
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
__mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596
mutex_lock_io_nested+0x45/0x60 kernel/locking/mutex.c:777
jbd2_journal_flush+0x290/0xc90 fs/jbd2/journal.c:2474
__ocfs2_flush_truncate_log+0x309/0x11c0 fs/ocfs2/alloc.c:6021
ocfs2_flush_truncate_log+0x4b/0x60 fs/ocfs2/alloc.c:6067
ocfs2_sync_fs+0x121/0x380 fs/ocfs2/super.c:403
sync_filesystem+0x1bc/0x220 fs/sync.c:66
generic_shutdown_super+0x6b/0x310 fs/super.c:448
kill_block_super+0x7a/0xe0 fs/super.c:1427
deactivate_locked_super+0xa0/0x110 fs/super.c:335
cleanup_mnt+0x44e/0x500 fs/namespace.c:1143
task_work_run+0x129/0x1a0 kernel/task_work.c:188
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:181
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
-> #4 (&journal->j_barrier){+.+.}-{3:3}:
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
__mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
jbd2_journal_lock_updates+0x2aa/0x370 fs/jbd2/transaction.c:905
__ocfs2_flush_truncate_log+0x2e7/0x11c0 fs/ocfs2/alloc.c:6020
ocfs2_flush_truncate_log+0x4b/0x60 fs/ocfs2/alloc.c:6067
ocfs2_sync_fs+0x121/0x380 fs/ocfs2/super.c:403
sync_filesystem+0x1bc/0x220 fs/sync.c:66
generic_shutdown_super+0x6b/0x310 fs/super.c:448
kill_block_super+0x7a/0xe0 fs/super.c:1427
deactivate_locked_super+0xa0/0x110 fs/super.c:335
cleanup_mnt+0x44e/0x500 fs/namespace.c:1143
task_work_run+0x129/0x1a0 kernel/task_work.c:188
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:181
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
-> #3 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{3:3}:
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
down_write+0x38/0x60 kernel/locking/rwsem.c:1551
inode_lock include/linux/fs.h:789 [inline]
ocfs2_remove_btree_range+0x733/0x18a0 fs/ocfs2/alloc.c:5735
ocfs2_remove_inode_range+0xd75/0x2640 fs/ocfs2/file.c:1899
ocfs2_reflink_remap_extent fs/ocfs2/refcounttree.c:4571 [inline]
ocfs2_reflink_remap_blocks+0xccf/0x1f20 fs/ocfs2/refcounttree.c:4718
ocfs2_remap_file_range+0x5f2/0x8d0 fs/ocfs2/file.c:2691
vfs_copy_file_range+0xfc9/0x14e0 fs/read_write.c:1510
__do_sys_copy_file_range fs/read_write.c:1588 [inline]
__se_sys_copy_file_range+0x3ea/0x5d0 fs/read_write.c:1551
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
-> #2 (&oi->ip_alloc_sem){++++}-{3:3}:
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
down_write+0x38/0x60 kernel/locking/rwsem.c:1551
ocfs2_page_mkwrite+0x301/0xbd0 fs/ocfs2/mmap.c:142
do_page_mkwrite+0x1a9/0x440 mm/memory.c:2909
do_shared_fault mm/memory.c:4315 [inline]
do_fault mm/memory.c:4383 [inline]
handle_pte_fault mm/memory.c:4637 [inline]
__handle_mm_fault mm/memory.c:4772 [inline]
handle_mm_fault+0x2803/0x5960 mm/memory.c:4870
do_user_addr_fault arch/x86/mm/fault.c:1357 [inline]
handle_page_fault arch/x86/mm/fault.c:1445 [inline]
exc_page_fault+0x271/0x700 arch/x86/mm/fault.c:1501
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
-> #1 (sb_pagefaults#3){.+.+}-{0:0}:
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1813 [inline]
sb_start_pagefault include/linux/fs.h:1912 [inline]
ocfs2_page_mkwrite+0x1d9/0xbd0 fs/ocfs2/mmap.c:122
do_page_mkwrite+0x1a9/0x440 mm/memory.c:2909
do_shared_fault mm/memory.c:4315 [inline]
do_fault mm/memory.c:4383 [inline]
handle_pte_fault mm/memory.c:4637 [inline]
__handle_mm_fault mm/memory.c:4772 [inline]
handle_mm_fault+0x2803/0x5960 mm/memory.c:4870
do_user_addr_fault arch/x86/mm/fault.c:1357 [inline]
handle_page_fault arch/x86/mm/fault.c:1445 [inline]
exc_page_fault+0x271/0x700 arch/x86/mm/fault.c:1501
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
-> #0 (&mm->mmap_lock){++++}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3053 [inline]
check_prevs_add kernel/locking/lockdep.c:3172 [inline]
validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788
__lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498
mmap_read_lock+0x1c/0x50 include/linux/mmap_lock.h:117
do_user_addr_fault arch/x86/mm/fault.c:1308 [inline]
handle_page_fault arch/x86/mm/fault.c:1445 [inline]
exc_page_fault+0x596/0x700 arch/x86/mm/fault.c:1501
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
__get_user_nocheck_1+0x6/0x10 arch/x86/lib/getuser.S:103
fault_in_readable+0x172/0x2e0 mm/gup.c:1801
fault_in_iov_iter_readable+0x14a/0x1d0 lib/iov_iter.c:460
generic_perform_write+0x1c9/0x5b0 mm/filemap.c:3775
ext4_buffered_write_iter+0x227/0x360 fs/ext4/file.c:268
ext4_file_write_iter+0x1d1/0x1940 fs/ext4/file.c:662
call_write_iter include/linux/fs.h:2174 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0xacd/0xe50 fs/read_write.c:594
ksys_write+0x1a2/0x2c0 fs/read_write.c:647
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
other info that might help us debug this:
Chain exists of:
&mm->mmap_lock --> &journal->j_checkpoint_mutex --> &sb->s_type->i_mutex_key#9
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&sb->s_type->i_mutex_key#9);
lock(&journal->j_checkpoint_mutex);
lock(&sb->s_type->i_mutex_key#9);
lock(&mm->mmap_lock);
*** DEADLOCK ***
3 locks held by syz.1.508/6152:
#0: ffff888076f26ff0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2cb/0x380 fs/file.c:1057
#1: ffff88807404c460 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x29a/0xe50 fs/read_write.c:590
#2: ffff8880733e0de8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline]
#2: ffff8880733e0de8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xa0/0x360 fs/ext4/file.c:262
stack backtrace:
CPU: 0 PID: 6152 Comm: syz.1.508 Not tainted 5.15.169-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133
check_prev_add kernel/locking/lockdep.c:3053 [inline]
check_prevs_add kernel/locking/lockdep.c:3172 [inline]
validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788
__lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498
mmap_read_lock+0x1c/0x50 include/linux/mmap_lock.h:117
do_user_addr_fault arch/x86/mm/fault.c:1308 [inline]
handle_page_fault arch/x86/mm/fault.c:1445 [inline]
exc_page_fault+0x596/0x700 arch/x86/mm/fault.c:1501
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0010:__get_user_nocheck_1+0x6/0x10 arch/x86/lib/getuser.S:124
Code: d0 73 64 48 19 d2 48 21 d0 0f 01 cb 48 8b 10 31 c0 0f 01 ca c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 0f 01 cb 0f ae e8 <0f> b6 10 31 c0 0f 01 ca c3 90 0f 01 cb 0f ae e8 0f b7 10 31 c0 0f
RSP: 0018:ffffc90003087858 EFLAGS: 00050287
RAX: 0000000020321000 RBX: 0000000020320400 RCX: 0000000000040000
RDX: ffffc900061a1000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffffc90003087918 R08: ffffffff81b743a6 R09: fffffbfff1bd2cb6
R10: 0000000000000000 R11: dffffc0000000001 R12: 00000000ffffffff
R13: 0000000020321000 R14: 0000000020322000 R15: 0000000000000000
fault_in_readable+0x172/0x2e0 mm/gup.c:1801
fault_in_iov_iter_readable+0x14a/0x1d0 lib/iov_iter.c:460
generic_perform_write+0x1c9/0x5b0 mm/filemap.c:3775
ext4_buffered_write_iter+0x227/0x360 fs/ext4/file.c:268
ext4_file_write_iter+0x1d1/0x1940 fs/ext4/file.c:662
call_write_iter include/linux/fs.h:2174 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0xacd/0xe50 fs/read_write.c:594
ksys_write+0x1a2/0x2c0 fs/read_write.c:647
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fce59119ff9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fce57592038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fce592d1f80 RCX: 00007fce59119ff9
RDX: 000000000208e24b RSI: 0000000020001400 RDI: 0000000000000005
RBP: 00007fce5918c296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fce592d1f80 R15: 00007ffc8bac1ce8
</TASK>
----------------
Code disassembly (best guess):
0: d0 73 64 shlb 0x64(%rbx)
3: 48 19 d2 sbb %rdx,%rdx
6: 48 21 d0 and %rdx,%rax
9: 0f 01 cb stac
c: 48 8b 10 mov (%rax),%rdx
f: 31 c0 xor %eax,%eax
11: 0f 01 ca clac
14: c3 ret
15: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
1c: 00 00 00
1f: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
24: 0f 01 cb stac
27: 0f ae e8 lfence
* 2a: 0f b6 10 movzbl (%rax),%edx <-- trapping instruction
2d: 31 c0 xor %eax,%eax
2f: 0f 01 ca clac
32: c3 ret
33: 90 nop
34: 0f 01 cb stac
37: 0f ae e8 lfence
3a: 0f b7 10 movzwl (%rax),%edx
3d: 31 c0 xor %eax,%eax
3f: 0f .byte 0xf