REISERFS (device loop1): Created .reiserfs_priv - reserved for xattr storage.
======================================================
WARNING: possible circular locking dependency detected
5.15.182-syzkaller #0 Not tainted
------------------------------------------------------
syz.1.140/4604 is trying to acquire lock:
ffff0000d9396090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x7c/0xe8 fs/reiserfs/lock.c:27
but task is already holding lock:
ffff0000d2970118 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
ffff0000d2970118 (&mm->mmap_lock){++++}-{3:3}, at: do_mbind mm/mempolicy.c:1299 [inline]
ffff0000d2970118 (&mm->mmap_lock){++++}-{3:3}, at: kernel_mbind mm/mempolicy.c:1472 [inline]
ffff0000d2970118 (&mm->mmap_lock){++++}-{3:3}, at: __do_sys_mbind mm/mempolicy.c:1479 [inline]
ffff0000d2970118 (&mm->mmap_lock){++++}-{3:3}, at: __se_sys_mbind mm/mempolicy.c:1475 [inline]
ffff0000d2970118 (&mm->mmap_lock){++++}-{3:3}, at: __arm64_sys_mbind+0x524/0x7b8 mm/mempolicy.c:1475
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&mm->mmap_lock){++++}-{3:3}:
__might_fault+0xc8/0x128 mm/memory.c:5357
reiserfs_ioctl+0x144/0x4b4 fs/reiserfs/ioctl.c:96
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
-> #0 (&sbi->lock){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3053 [inline]
check_prevs_add kernel/locking/lockdep.c:3172 [inline]
validate_chain kernel/locking/lockdep.c:3788 [inline]
__lock_acquire+0x2928/0x651c kernel/locking/lockdep.c:5012
lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623
__mutex_lock_common+0x194/0x1edc kernel/locking/mutex.c:596
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0xac/0x11c kernel/locking/mutex.c:743
reiserfs_write_lock+0x7c/0xe8 fs/reiserfs/lock.c:27
map_block_for_writepage fs/reiserfs/inode.c:2396 [inline]
reiserfs_write_full_page fs/reiserfs/inode.c:2593 [inline]
reiserfs_writepage+0x708/0x2c18 fs/reiserfs/inode.c:2745
writeout mm/migrate.c:837 [inline]
fallback_migrate_page mm/migrate.c:861 [inline]
move_to_new_page+0x5e0/0xc28 mm/migrate.c:912
__unmap_and_move mm/migrate.c:1077 [inline]
unmap_and_move mm/migrate.c:1218 [inline]
migrate_pages+0x197c/0x3020 mm/migrate.c:1495
do_mbind mm/mempolicy.c:1325 [inline]
kernel_mbind mm/mempolicy.c:1472 [inline]
__do_sys_mbind mm/mempolicy.c:1479 [inline]
__se_sys_mbind mm/mempolicy.c:1475 [inline]
__arm64_sys_mbind+0x618/0x7b8 mm/mempolicy.c:1475
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&mm->mmap_lock);
lock(&sbi->lock);
lock(&mm->mmap_lock);
lock(&sbi->lock);
*** DEADLOCK ***
1 lock held by syz.1.140/4604:
#0: ffff0000d2970118 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline]
#0: ffff0000d2970118 (&mm->mmap_lock){++++}-{3:3}, at: do_mbind mm/mempolicy.c:1299 [inline]
#0: ffff0000d2970118 (&mm->mmap_lock){++++}-{3:3}, at: kernel_mbind mm/mempolicy.c:1472 [inline]
#0: ffff0000d2970118 (&mm->mmap_lock){++++}-{3:3}, at: __do_sys_mbind mm/mempolicy.c:1479 [inline]
#0: ffff0000d2970118 (&mm->mmap_lock){++++}-{3:3}, at: __se_sys_mbind mm/mempolicy.c:1475 [inline]
#0: ffff0000d2970118 (&mm->mmap_lock){++++}-{3:3}, at: __arm64_sys_mbind+0x524/0x7b8 mm/mempolicy.c:1475
stack backtrace:
CPU: 1 PID: 4604 Comm: syz.1.140 Not tainted 5.15.182-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call trace:
dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
__dump_stack+0x30/0x40 lib/dump_stack.c:88
dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
dump_stack+0x1c/0x5c lib/dump_stack.c:113
print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2011
check_noncircular+0x240/0x2d4 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 kernel/locking/lockdep.c:3788 [inline]
__lock_acquire+0x2928/0x651c kernel/locking/lockdep.c:5012
lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623
__mutex_lock_common+0x194/0x1edc kernel/locking/mutex.c:596
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0xac/0x11c kernel/locking/mutex.c:743
reiserfs_write_lock+0x7c/0xe8 fs/reiserfs/lock.c:27
map_block_for_writepage fs/reiserfs/inode.c:2396 [inline]
reiserfs_write_full_page fs/reiserfs/inode.c:2593 [inline]
reiserfs_writepage+0x708/0x2c18 fs/reiserfs/inode.c:2745
writeout mm/migrate.c:837 [inline]
fallback_migrate_page mm/migrate.c:861 [inline]
move_to_new_page+0x5e0/0xc28 mm/migrate.c:912
__unmap_and_move mm/migrate.c:1077 [inline]
unmap_and_move mm/migrate.c:1218 [inline]
migrate_pages+0x197c/0x3020 mm/migrate.c:1495
do_mbind mm/mempolicy.c:1325 [inline]
kernel_mbind mm/mempolicy.c:1472 [inline]
__do_sys_mbind mm/mempolicy.c:1479 [inline]
__se_sys_mbind mm/mempolicy.c:1475 [inline]
__arm64_sys_mbind+0x618/0x7b8 mm/mempolicy.c:1475
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584