====================================================== WARNING: possible circular locking dependency detected 6.9.0-syzkaller-08567-ge245ef8a0b06 #0 Not tainted ------------------------------------------------------ syz-executor.4/6484 is trying to acquire lock: ffff88802224f3f0 (clock-AF_UNIX){+...}-{2:2}, at: sk_psock_drop+0x34/0x500 net/core/skmsg.c:837 but task is already holding lock: ffff888025351a20 (&stab->lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline] ffff888025351a20 (&stab->lock){+...}-{2:2}, at: __sock_map_delete net/core/sock_map.c:429 [inline] ffff888025351a20 (&stab->lock){+...}-{2:2}, at: sock_map_delete_elem+0x175/0x250 net/core/sock_map.c:461 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&stab->lock){+...}-{2:2}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] __sock_map_delete net/core/sock_map.c:429 [inline] sock_map_delete_elem+0x175/0x250 net/core/sock_map.c:461 bpf_prog_8a405b5ced52e191+0x32/0x4e bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline] __bpf_prog_run include/linux/filter.h:691 [inline] bpf_prog_run include/linux/filter.h:698 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2403 [inline] bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2444 trace_kfree include/trace/events/kmem.h:94 [inline] kfree+0x2bd/0x3b0 mm/slub.c:4450 __bpf_prog_put_noref+0xd7/0x310 kernel/bpf/syscall.c:2257 bpf_prog_put_deferred+0x2f3/0x3e0 kernel/bpf/syscall.c:2283 __bpf_prog_put kernel/bpf/syscall.c:2295 [inline] bpf_prog_put+0x264/0x2a0 kernel/bpf/syscall.c:2302 psock_set_prog include/linux/skmsg.h:481 [inline] sk_psock_stop_verdict net/core/skmsg.c:1247 [inline] sk_psock_drop+0x214/0x500 net/core/skmsg.c:843 sk_psock_put include/linux/skmsg.h:463 [inline] sock_map_close+0x209/0x2d0 net/core/sock_map.c:1695 unix_release+0x85/0xc0 net/unix/af_unix.c:1048 __sock_release net/socket.c:659 [inline] sock_close+0xbc/0x240 net/socket.c:1421 __fput+0x429/0x8a0 fs/file_table.c:422 __do_sys_close fs/open.c:1556 [inline] __se_sys_close fs/open.c:1541 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1541 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (clock-AF_UNIX){+...}-{2:2}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain+0x18cb/0x58e0 kernel/locking/lockdep.c:3869 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __raw_write_lock_bh include/linux/rwlock_api_smp.h:202 [inline] _raw_write_lock_bh+0x35/0x50 kernel/locking/spinlock.c:334 sk_psock_drop+0x34/0x500 net/core/skmsg.c:837 __sock_map_delete net/core/sock_map.c:435 [inline] sock_map_delete_elem+0x1a2/0x250 net/core/sock_map.c:461 bpf_prog_8a405b5ced52e191+0x4a/0x4e bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline] __bpf_prog_run include/linux/filter.h:691 [inline] bpf_prog_run include/linux/filter.h:698 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2403 [inline] bpf_trace_run1+0x2ca/0x520 kernel/trace/bpf_trace.c:2443 trace_scsi_dispatch_cmd_start include/trace/events/scsi.h:156 [inline] scsi_dispatch_cmd drivers/scsi/scsi_lib.c:1608 [inline] scsi_queue_rq+0x2d7d/0x2f70 drivers/scsi/scsi_lib.c:1851 blk_mq_dispatch_rq_list+0xb89/0x1b30 block/blk-mq.c:2037 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:170 [inline] blk_mq_do_dispatch_sched block/blk-mq-sched.c:184 [inline] __blk_mq_sched_dispatch_requests+0xb8a/0x1840 block/blk-mq-sched.c:309 blk_mq_sched_dispatch_requests+0xcb/0x140 block/blk-mq-sched.c:331 blk_mq_run_hw_queue+0x9a5/0xae0 block/blk-mq.c:2250 blk_mq_flush_plug_list+0x1115/0x1880 block/blk-mq.c:2799 __blk_flush_plug+0x420/0x500 block/blk-core.c:1190 blk_finish_plug+0x5e/0x80 block/blk-core.c:1217 ext4_do_writepages+0x34df/0x3d40 fs/ext4/inode.c:2730 ext4_writepages+0x213/0x3c0 fs/ext4/inode.c:2768 do_writepages+0x359/0x870 mm/page-writeback.c:2613 filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:397 __filemap_fdatawrite_range mm/filemap.c:430 [inline] file_write_and_wait_range+0x1aa/0x290 mm/filemap.c:788 ext4_sync_file+0x260/0xb90 fs/ext4/fsync.c:158 generic_write_sync include/linux/fs.h:2811 [inline] ext4_buffered_write_iter+0x286/0x350 fs/ext4/file.c:305 ext4_file_write_iter+0x1de/0x1a10 call_write_iter include/linux/fs.h:2120 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa2d/0xc50 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&stab->lock); lock(clock-AF_UNIX); lock(&stab->lock); lock(clock-AF_UNIX); *** DEADLOCK *** 6 locks held by syz-executor.4/6484: #0: ffff888024b0f248 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x259/0x320 fs/file.c:1191 #1: ffff88801e148420 (sb_writers#4){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2871 [inline] #1: ffff88801e148420 (sb_writers#4){.+.+}-{0:0}, at: vfs_write+0x227/0xc50 fs/read_write.c:586 #2: ffff88801e14ab98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1769 [inline] #2: ffff88801e14ab98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bf/0x3c0 fs/ext4/inode.c:2767 #3: ffffffff8e333d20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #3: ffffffff8e333d20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #3: ffffffff8e333d20 (rcu_read_lock){....}-{1:2}, at: blk_mq_run_hw_queue+0x40c/0xae0 block/blk-mq.c:2250 #4: ffffffff8e333d20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #4: ffffffff8e333d20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #4: ffffffff8e333d20 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2402 [inline] #4: ffffffff8e333d20 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run1+0x1d6/0x520 kernel/trace/bpf_trace.c:2443 #5: ffff888025351a20 (&stab->lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline] #5: ffff888025351a20 (&stab->lock){+...}-{2:2}, at: __sock_map_delete net/core/sock_map.c:429 [inline] #5: ffff888025351a20 (&stab->lock){+...}-{2:2}, at: sock_map_delete_elem+0x175/0x250 net/core/sock_map.c:461 stack backtrace: CPU: 1 PID: 6484 Comm: syz-executor.4 Not tainted 6.9.0-syzkaller-08567-ge245ef8a0b06 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain+0x18cb/0x58e0 kernel/locking/lockdep.c:3869 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __raw_write_lock_bh include/linux/rwlock_api_smp.h:202 [inline] _raw_write_lock_bh+0x35/0x50 kernel/locking/spinlock.c:334 sk_psock_drop+0x34/0x500 net/core/skmsg.c:837 __sock_map_delete net/core/sock_map.c:435 [inline] sock_map_delete_elem+0x1a2/0x250 net/core/sock_map.c:461 bpf_prog_8a405b5ced52e191+0x4a/0x4e bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline] __bpf_prog_run include/linux/filter.h:691 [inline] bpf_prog_run include/linux/filter.h:698 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2403 [inline] bpf_trace_run1+0x2ca/0x520 kernel/trace/bpf_trace.c:2443 trace_scsi_dispatch_cmd_start include/trace/events/scsi.h:156 [inline] scsi_dispatch_cmd drivers/scsi/scsi_lib.c:1608 [inline] scsi_queue_rq+0x2d7d/0x2f70 drivers/scsi/scsi_lib.c:1851 blk_mq_dispatch_rq_list+0xb89/0x1b30 block/blk-mq.c:2037 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:170 [inline] blk_mq_do_dispatch_sched block/blk-mq-sched.c:184 [inline] __blk_mq_sched_dispatch_requests+0xb8a/0x1840 block/blk-mq-sched.c:309 blk_mq_sched_dispatch_requests+0xcb/0x140 block/blk-mq-sched.c:331 blk_mq_run_hw_queue+0x9a5/0xae0 block/blk-mq.c:2250 blk_mq_flush_plug_list+0x1115/0x1880 block/blk-mq.c:2799 __blk_flush_plug+0x420/0x500 block/blk-core.c:1190 blk_finish_plug+0x5e/0x80 block/blk-core.c:1217 ext4_do_writepages+0x34df/0x3d40 fs/ext4/inode.c:2730 ext4_writepages+0x213/0x3c0 fs/ext4/inode.c:2768 do_writepages+0x359/0x870 mm/page-writeback.c:2613 filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:397 __filemap_fdatawrite_range mm/filemap.c:430 [inline] file_write_and_wait_range+0x1aa/0x290 mm/filemap.c:788 ext4_sync_file+0x260/0xb90 fs/ext4/fsync.c:158 generic_write_sync include/linux/fs.h:2811 [inline] ext4_buffered_write_iter+0x286/0x350 fs/ext4/file.c:305 ext4_file_write_iter+0x1de/0x1a10 call_write_iter include/linux/fs.h:2120 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa2d/0xc50 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff58de7cee9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff58ec5b0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ff58dfabf80 RCX: 00007ff58de7cee9 RDX: 0000000000000012 RSI: 0000000020000980 RDI: 0000000000000004 RBP: 00007ff58dec949e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007ff58dfabf80 R15: 00007ffd1a0ff758