loop0: detected capacity change from 32768 to 32736
======================================================
WARNING: possible circular locking dependency detected
6.15.0-rc1-syzkaller-00065-g3b07108ada81 #0 Not tainted
------------------------------------------------------
syz.0.15/5621 is trying to acquire lock:
ffffffff90467508 (uevent_sock_mutex){+.+.}-{4:4}, at: uevent_net_broadcast_untagged lib/kobject_uevent.c:317 [inline]
ffffffff90467508 (uevent_sock_mutex){+.+.}-{4:4}, at: kobject_uevent_net_broadcast+0x280/0x580 lib/kobject_uevent.c:410

but task is already holding lock:
ffff888000c01de8 (&q->q_usage_counter(io)#17){++++}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:928 [inline]
ffff888000c01de8 (&q->q_usage_counter(io)#17){++++}-{0:0}, at: loop_set_status+0x223/0xb20 drivers/block/loop.c:1291

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&q->q_usage_counter(io)#17){++++}-{0:0}:
       lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
       blk_alloc_queue+0x542/0x620 block/blk-core.c:461
       blk_mq_alloc_queue block/blk-mq.c:4348 [inline]
       __blk_mq_alloc_disk+0x162/0x380 block/blk-mq.c:4395
       loop_add+0x445/0xaf0 drivers/block/loop.c:2067
       loop_init+0x168/0x220 drivers/block/loop.c:2302
       do_one_initcall+0x24a/0x940 init/main.c:1257
       do_initcall_level+0x157/0x210 init/main.c:1319
       do_initcalls+0x71/0xd0 init/main.c:1335
       kernel_init_freeable+0x432/0x5d0 init/main.c:1567
       kernel_init+0x1d/0x2b0 init/main.c:1457
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

-> #1 (fs_reclaim){+.+.}-{0:0}:
       lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
       __fs_reclaim_acquire mm/page_alloc.c:4028 [inline]
       fs_reclaim_acquire+0x88/0x130 mm/page_alloc.c:4042
       might_alloc include/linux/sched/mm.h:318 [inline]
       slab_pre_alloc_hook mm/slub.c:4102 [inline]
       slab_alloc_node mm/slub.c:4180 [inline]
       kmem_cache_alloc_node_noprof+0x4e/0x3b0 mm/slub.c:4252
       __alloc_skb+0x1c2/0x480 net/core/skbuff.c:658
       alloc_skb include/linux/skbuff.h:1340 [inline]
       alloc_uevent_skb+0x74/0x230 lib/kobject_uevent.c:289
       uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline]
       kobject_uevent_net_broadcast+0x2fd/0x580 lib/kobject_uevent.c:410
       kobject_uevent_env+0x57d/0x8e0 lib/kobject_uevent.c:608
       kobject_synth_uevent+0x4f4/0xaf0 lib/kobject_uevent.c:207
       bus_uevent_store+0x116/0x170 drivers/base/bus.c:832
       kernfs_fop_write_iter+0x398/0x510 fs/kernfs/file.c:334
       new_sync_write fs/read_write.c:591 [inline]
       vfs_write+0x70f/0xd10 fs/read_write.c:684
       ksys_write+0x19d/0x2d0 fs/read_write.c:736
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (uevent_sock_mutex){+.+.}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3166 [inline]
       check_prevs_add kernel/locking/lockdep.c:3285 [inline]
       validate_chain+0xa69/0x24e0 kernel/locking/lockdep.c:3909
       __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235
       lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
       __mutex_lock_common kernel/locking/mutex.c:601 [inline]
       __mutex_lock+0x1a5/0x10c0 kernel/locking/mutex.c:746
       uevent_net_broadcast_untagged lib/kobject_uevent.c:317 [inline]
       kobject_uevent_net_broadcast+0x280/0x580 lib/kobject_uevent.c:410
       kobject_uevent_env+0x57d/0x8e0 lib/kobject_uevent.c:608
       set_capacity_and_notify+0x269/0x2d0 block/genhd.c:102
       loop_set_size drivers/block/loop.c:210 [inline]
       loop_set_status+0x4a4/0xb20 drivers/block/loop.c:1306
       lo_ioctl+0xce1/0x2850 drivers/block/loop.c:-1
       blkdev_ioctl+0x5df/0x710 block/ioctl.c:698
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:906 [inline]
       __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  uevent_sock_mutex --> fs_reclaim --> &q->q_usage_counter(io)#17

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&q->q_usage_counter(io)#17);
                               lock(fs_reclaim);
                               lock(&q->q_usage_counter(io)#17);
  lock(uevent_sock_mutex);

 *** DEADLOCK ***

3 locks held by syz.0.15/5621:
 #0: ffff88803441db68 (&lo->lo_mutex){+.+.}-{4:4}, at: loop_set_status+0x2b/0xb20 drivers/block/loop.c:1275
 #1: ffff888000c01de8 (&q->q_usage_counter(io)#17){++++}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:928 [inline]
 #1: ffff888000c01de8 (&q->q_usage_counter(io)#17){++++}-{0:0}, at: loop_set_status+0x223/0xb20 drivers/block/loop.c:1291
 #2: ffff888000c01e20 (&q->q_usage_counter(queue)#20){+.+.}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:928 [inline]
 #2: ffff888000c01e20 (&q->q_usage_counter(queue)#20){+.+.}-{0:0}, at: loop_set_status+0x223/0xb20 drivers/block/loop.c:1291

stack backtrace:
CPU: 0 UID: 0 PID: 5621 Comm: syz.0.15 Not tainted 6.15.0-rc1-syzkaller-00065-g3b07108ada81 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2079
 check_noncircular+0x142/0x160 kernel/locking/lockdep.c:2211
 check_prev_add kernel/locking/lockdep.c:3166 [inline]
 check_prevs_add kernel/locking/lockdep.c:3285 [inline]
 validate_chain+0xa69/0x24e0 kernel/locking/lockdep.c:3909
 __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235
 lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
 __mutex_lock_common kernel/locking/mutex.c:601 [inline]
 __mutex_lock+0x1a5/0x10c0 kernel/locking/mutex.c:746
 uevent_net_broadcast_untagged lib/kobject_uevent.c:317 [inline]
 kobject_uevent_net_broadcast+0x280/0x580 lib/kobject_uevent.c:410
 kobject_uevent_env+0x57d/0x8e0 lib/kobject_uevent.c:608
 set_capacity_and_notify+0x269/0x2d0 block/genhd.c:102
 loop_set_size drivers/block/loop.c:210 [inline]
 loop_set_status+0x4a4/0xb20 drivers/block/loop.c:1306
 lo_ioctl+0xce1/0x2850 drivers/block/loop.c:-1
 blkdev_ioctl+0x5df/0x710 block/ioctl.c:698
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f125497dff9
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:00007f1255833038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1254b35f80 RCX: 00007f125497dff9
RDX: 0000000020000100 RSI: 0000000000004c02 RDI: 0000000000000005
RBP: 00007f12549f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1254b35f80 R15: 00007fff2e5e1e38
 </TASK>
ERROR: (device loop0): dbAllocBits: leaf page corrupt

------------[ cut here ]------------
UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:3019:55
shift exponent 32 is too large for 32-bit type 'u32' (aka 'unsigned int')
CPU: 0 UID: 0 PID: 5621 Comm: syz.0.15 Not tainted 6.15.0-rc1-syzkaller-00065-g3b07108ada81 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:492
 dbFindBits+0x11a/0x1d0 fs/jfs/jfs_dmap.c:3019
 dbAllocDmapLev+0x22c/0x4b0 fs/jfs/jfs_dmap.c:1973
 dbAllocCtl+0x149/0x9b0 fs/jfs/jfs_dmap.c:1813
 dbAllocAG+0x2a1/0x1130 fs/jfs/jfs_dmap.c:1349
 dbDiscardAG+0x369/0xa40 fs/jfs/jfs_dmap.c:1598
 jfs_ioc_trim+0x45c/0x6b0 fs/jfs/jfs_discard.c:105
 jfs_ioctl+0x2e5/0x400 fs/jfs/ioctl.c:131
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f125497dff9
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:00007f1255833038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1254b35f80 RCX: 00007f125497dff9
RDX: 00000000200000c0 RSI: 00000000c0185879 RDI: 0000000000000004
RBP: 00007f12549f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1254b35f80 R15: 00007fff2e5e1e38
 </TASK>
---[ end trace ]---