======================================================
WARNING: possible circular locking dependency detected
6.4.0-rc7-next-20230621-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.3/7150 is trying to acquire lock:
ffff888077954da0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:142 [inline]
ffff888077954da0 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0xb3d/0x1210 arch/x86/mm/fault.c:1391
but task is already holding lock:
ffff8880756f2250 (&sb->s_type->i_mutex_key#26){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:771 [inline]
ffff8880756f2250 (&sb->s_type->i_mutex_key#26){+.+.}-{3:3}, at: f2fs_file_write_iter+0x297/0x2500 fs/f2fs/file.c:4744
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&sb->s_type->i_mutex_key#26){+.+.}-{3:3}:
down_write+0x92/0x200 kernel/locking/rwsem.c:1573
inode_lock include/linux/fs.h:771 [inline]
f2fs_file_mmap+0x154/0x290 fs/f2fs/file.c:527
call_mmap include/linux/fs.h:1876 [inline]
mmap_region+0x6cf/0x2570 mm/mmap.c:2669
do_mmap+0x850/0xee0 mm/mmap.c:1373
vm_mmap_pgoff+0x1a2/0x3b0 mm/util.c:543
ksys_mmap_pgoff+0x42b/0x5b0 mm/mmap.c:1419
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #0 (&mm->mmap_lock){++++}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3142 [inline]
check_prevs_add kernel/locking/lockdep.c:3261 [inline]
validate_chain kernel/locking/lockdep.c:3876 [inline]
__lock_acquire+0x2e9d/0x5e20 kernel/locking/lockdep.c:5144
lock_acquire.part.0+0x11c/0x370 kernel/locking/lockdep.c:5761
down_read+0x9c/0x480 kernel/locking/rwsem.c:1520
mmap_read_lock include/linux/mmap_lock.h:142 [inline]
do_user_addr_fault+0xb3d/0x1210 arch/x86/mm/fault.c:1391
handle_page_fault arch/x86/mm/fault.c:1534 [inline]
exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1590
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
fault_in_readable+0x129/0x210 mm/gup.c:1928
fault_in_iov_iter_readable+0x252/0x2c0 lib/iov_iter.c:216
generic_perform_write+0x1c2/0x5d0 mm/filemap.c:3919
f2fs_buffered_write_iter fs/f2fs/file.c:4567 [inline]
f2fs_file_write_iter+0xbf7/0x2500 fs/f2fs/file.c:4767
call_write_iter include/linux/fs.h:1871 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x981/0xda0 fs/read_write.c:584
ksys_write+0x122/0x250 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&sb->s_type->i_mutex_key#26);
lock(&mm->mmap_lock);
lock(&sb->s_type->i_mutex_key#26);
rlock(&mm->mmap_lock);
*** DEADLOCK ***
3 locks held by syz-executor.3/7150:
#0: ffff88802ae8b248 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xd7/0xf0 fs/file.c:1047
#1: ffff88808c7c2410 (sb_writers#19){.+.+}-{0:0}, at: ksys_write+0x122/0x250 fs/read_write.c:637
#2: ffff8880756f2250 (&sb->s_type->i_mutex_key#26){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:771 [inline]
#2: ffff8880756f2250 (&sb->s_type->i_mutex_key#26){+.+.}-{3:3}, at: f2fs_file_write_iter+0x297/0x2500 fs/f2fs/file.c:4744
stack backtrace:
CPU: 1 PID: 7150 Comm: syz-executor.3 Not tainted 6.4.0-rc7-next-20230621-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
check_noncircular+0x2df/0x3b0 kernel/locking/lockdep.c:2195
check_prev_add kernel/locking/lockdep.c:3142 [inline]
check_prevs_add kernel/locking/lockdep.c:3261 [inline]
validate_chain kernel/locking/lockdep.c:3876 [inline]
__lock_acquire+0x2e9d/0x5e20 kernel/locking/lockdep.c:5144
lock_acquire.part.0+0x11c/0x370 kernel/locking/lockdep.c:5761
down_read+0x9c/0x480 kernel/locking/rwsem.c:1520
mmap_read_lock include/linux/mmap_lock.h:142 [inline]
do_user_addr_fault+0xb3d/0x1210 arch/x86/mm/fault.c:1391
handle_page_fault arch/x86/mm/fault.c:1534 [inline]
exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1590
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0010:fault_in_readable+0x129/0x210 mm/gup.c:1928
Code: 95 c3 ff 48 39 dd 0f 84 ec 00 00 00 45 31 f6 eb 11 e8 5b 95 c3 ff 48 81 c3 00 10 00 00 48 39 eb 74 1d e8 4a 95 c3 ff 45 89 f7 <8a> 03 31 ff 44 89 fe 88 44 24 28 e8 57 91 c3 ff 45 85 ff 74 d2 e8
RSP: 0018:ffffc90014f37a20 EFLAGS: 00050246
RAX: 0000000000040000 RBX: 0000000020046000 RCX: ffffc900045f1000
RDX: 0000000000040000 RSI: ffffffff81c0f1c6 RDI: 0000000000000007
RBP: 0000000020047000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000001000
R13: 0000000020046000 R14: 0000000000000000 R15: 0000000000000000
fault_in_iov_iter_readable+0x252/0x2c0 lib/iov_iter.c:216
generic_perform_write+0x1c2/0x5d0 mm/filemap.c:3919
f2fs_buffered_write_iter fs/f2fs/file.c:4567 [inline]
f2fs_file_write_iter+0xbf7/0x2500 fs/f2fs/file.c:4767
call_write_iter include/linux/fs.h:1871 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x981/0xda0 fs/read_write.c:584
ksys_write+0x122/0x250 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f703508c389
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7035d74168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f70351abf80 RCX: 00007f703508c389
RDX: 000000000208e24b RSI: 0000000020000000 RDI: 000000000000000a
RBP: 00007f70350d7493 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff3788062f R14: 00007f7035d74300 R15: 0000000000022000
</TASK>
----------------
Code disassembly (best guess):
0: 95 xchg %eax,%ebp
1: c3 retq
2: ff 48 39 decl 0x39(%rax)
5: dd 0f fisttpll (%rdi)
7: 84 ec test %ch,%ah
9: 00 00 add %al,(%rax)
b: 00 45 31 add %al,0x31(%rbp)
e: f6 eb imul %bl
10: 11 e8 adc %ebp,%eax
12: 5b pop %rbx
13: 95 xchg %eax,%ebp
14: c3 retq
15: ff 48 81 decl -0x7f(%rax)
18: c3 retq
19: 00 10 add %dl,(%rax)
1b: 00 00 add %al,(%rax)
1d: 48 39 eb cmp %rbp,%rbx
20: 74 1d je 0x3f
22: e8 4a 95 c3 ff callq 0xffc39571
27: 45 89 f7 mov %r14d,%r15d
* 2a: 8a 03 mov (%rbx),%al <-- trapping instruction
2c: 31 ff xor %edi,%edi
2e: 44 89 fe mov %r15d,%esi
31: 88 44 24 28 mov %al,0x28(%rsp)
35: e8 57 91 c3 ff callq 0xffc39191
3a: 45 85 ff test %r15d,%r15d
3d: 74 d2 je 0x11
3f: e8 .byte 0xe8