====================================================== WARNING: possible circular locking dependency detected 6.9.0-rc6-syzkaller-00234-g7367539ad4b0 #0 Not tainted ------------------------------------------------------ syz-executor.3/10319 is trying to acquire lock: ffff8880b9429430 (krc.lock){..-.}-{2:2}, at: krc_this_cpu_lock kernel/rcu/tree.c:2960 [inline] ffff8880b9429430 (krc.lock){..-.}-{2:2}, at: add_ptr_to_bulk_krc_lock kernel/rcu/tree.c:3359 [inline] ffff8880b9429430 (krc.lock){..-.}-{2:2}, at: kvfree_call_rcu+0x18a/0x790 kernel/rcu/tree.c:3444 but task is already holding lock: ffff88804c8831f8 (&trie->lock){..-.}-{2:2}, at: trie_delete_elem+0x96/0x6a0 kernel/bpf/lpm_trie.c:451 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&trie->lock){..-.}-{2:2}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 trie_delete_elem+0x96/0x6a0 kernel/bpf/lpm_trie.c:451 bpf_prog_2c29ac5cdc6b1842+0x31/0x4a bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline] bpf_trace_run4+0x25c/0x490 kernel/trace/bpf_trace.c:2422 trace_mm_page_alloc include/trace/events/kmem.h:177 [inline] __alloc_pages+0x694/0x6c0 mm/page_alloc.c:4597 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2175 allocate_slab mm/slub.c:2338 [inline] new_slab+0x84/0x2f0 mm/slub.c:2391 ___slab_alloc+0xc73/0x1260 mm/slub.c:3525 __slab_alloc mm/slub.c:3610 [inline] __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] kmem_cache_alloc+0x252/0x340 mm/slub.c:3852 kmem_cache_zalloc include/linux/slab.h:739 [inline] fill_pool lib/debugobjects.c:168 [inline] debug_objects_fill_pool+0x67e/0x9b0 lib/debugobjects.c:615 debug_object_activate+0x135/0x510 lib/debugobjects.c:704 debug_hrtimer_activate kernel/time/hrtimer.c:423 [inline] debug_activate kernel/time/hrtimer.c:478 [inline] enqueue_hrtimer+0x30/0x3c0 kernel/time/hrtimer.c:1090 __run_hrtimer kernel/time/hrtimer.c:1709 [inline] __hrtimer_run_queues+0x6d5/0xd50 kernel/time/hrtimer.c:1756 hrtimer_run_softirq+0x19a/0x2c0 kernel/time/hrtimer.c:1773 __do_softirq+0x2c8/0x980 kernel/softirq.c:554 run_ksoftirqd+0xc5/0x130 kernel/softirq.c:924 smpboot_thread_fn+0x546/0xa30 kernel/smpboot.c:164 kthread+0x2f2/0x390 kernel/kthread.c:388 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #1 (hrtimer_bases.lock){-.-.}-{2:2}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 lock_hrtimer_base kernel/time/hrtimer.c:175 [inline] hrtimer_start_range_ns+0xdf/0xc60 kernel/time/hrtimer.c:1303 hrtimer_start include/linux/hrtimer.h:275 [inline] run_page_cache_worker kernel/rcu/tree.c:3341 [inline] kvfree_call_rcu+0x5e6/0x790 kernel/rcu/tree.c:3446 rtnl_register_internal+0x482/0x590 net/core/rtnetlink.c:265 rtnl_register+0x36/0x80 net/core/rtnetlink.c:315 ip_rt_init+0x2f5/0x3a0 net/ipv4/route.c:3720 ip_init+0xe/0x20 net/ipv4/ip_output.c:1663 inet_init+0x3d8/0x580 net/ipv4/af_inet.c:2023 do_one_initcall+0x24a/0x880 init/main.c:1245 do_initcall_level+0x157/0x210 init/main.c:1307 do_initcalls+0x3f/0x80 init/main.c:1323 kernel_init_freeable+0x435/0x5d0 init/main.c:1555 kernel_init+0x1d/0x2b0 init/main.c:1444 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #0 (krc.lock){..-.}-{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_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 krc_this_cpu_lock kernel/rcu/tree.c:2960 [inline] add_ptr_to_bulk_krc_lock kernel/rcu/tree.c:3359 [inline] kvfree_call_rcu+0x18a/0x790 kernel/rcu/tree.c:3444 trie_delete_elem+0x52c/0x6a0 bpf_prog_2c29ac5cdc6b1842+0x42/0x4a bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline] bpf_trace_run6+0x2a1/0x4d0 kernel/trace/bpf_trace.c:2424 __bpf_trace_jbd2_handle_extend+0x3d/0x50 include/trace/events/jbd2.h:178 trace_jbd2_handle_extend include/trace/events/jbd2.h:178 [inline] jbd2_journal_extend+0x708/0x780 fs/jbd2/transaction.c:698 ext4_datasem_ensure_credits+0x32/0x140 fs/ext4/extents.c:143 ext4_ext_rm_leaf fs/ext4/extents.c:2674 [inline] ext4_ext_remove_space+0x188d/0x4e40 fs/ext4/extents.c:2934 ext4_ext_truncate+0x159/0x2b0 fs/ext4/extents.c:4440 ext4_truncate+0xa18/0x1180 fs/ext4/inode.c:4146 ext4_setattr+0x119a/0x1bb0 fs/ext4/inode.c:5454 notify_change+0xb9f/0xe70 fs/attr.c:497 do_truncate+0x220/0x310 fs/open.c:65 handle_truncate fs/namei.c:3300 [inline] do_open fs/namei.c:3646 [inline] path_openat+0x29fe/0x3240 fs/namei.c:3799 do_filp_open+0x235/0x490 fs/namei.c:3826 do_sys_openat2+0x13e/0x1d0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_openat fs/open.c:1437 [inline] __se_sys_openat fs/open.c:1432 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1432 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: Chain exists of: krc.lock --> hrtimer_bases.lock --> &trie->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&trie->lock); lock(hrtimer_bases.lock); lock(&trie->lock); lock(krc.lock); *** DEADLOCK *** 8 locks held by syz-executor.3/10319: #0: ffff88802ce46420 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409 #1: ffff88805d4ae800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:795 [inline] #1: ffff88805d4ae800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: do_truncate+0x20c/0x310 fs/open.c:63 #2: ffff88805d4ae9a0 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:840 [inline] #2: ffff88805d4ae9a0 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_setattr+0xf35/0x1bb0 fs/ext4/inode.c:5378 #3: ffff88802ce4a950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x203f/0x22a0 fs/jbd2/transaction.c:463 #4: ffff88805d4ae688 (&ei->i_data_sem){++++}-{3:3}, at: ext4_truncate+0x991/0x1180 fs/ext4/inode.c:4141 #5: ffff88802ce4a0c8 (&journal->j_state_lock){++++}-{2:2}, at: jbd2_journal_extend+0x10d/0x780 fs/jbd2/transaction.c:673 #6: ffffffff8e334da0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #6: ffffffff8e334da0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #6: ffffffff8e334da0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2380 [inline] #6: ffffffff8e334da0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run6+0x1b3/0x4d0 kernel/trace/bpf_trace.c:2424 #7: ffff88804c8831f8 (&trie->lock){..-.}-{2:2}, at: trie_delete_elem+0x96/0x6a0 kernel/bpf/lpm_trie.c:451 stack backtrace: CPU: 0 PID: 10319 Comm: syz-executor.3 Not tainted 6.9.0-rc6-syzkaller-00234-g7367539ad4b0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 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_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 krc_this_cpu_lock kernel/rcu/tree.c:2960 [inline] add_ptr_to_bulk_krc_lock kernel/rcu/tree.c:3359 [inline] kvfree_call_rcu+0x18a/0x790 kernel/rcu/tree.c:3444 trie_delete_elem+0x52c/0x6a0 bpf_prog_2c29ac5cdc6b1842+0x42/0x4a bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline] bpf_trace_run6+0x2a1/0x4d0 kernel/trace/bpf_trace.c:2424 __bpf_trace_jbd2_handle_extend+0x3d/0x50 include/trace/events/jbd2.h:178 trace_jbd2_handle_extend include/trace/events/jbd2.h:178 [inline] jbd2_journal_extend+0x708/0x780 fs/jbd2/transaction.c:698 ext4_datasem_ensure_credits+0x32/0x140 fs/ext4/extents.c:143 ext4_ext_rm_leaf fs/ext4/extents.c:2674 [inline] ext4_ext_remove_space+0x188d/0x4e40 fs/ext4/extents.c:2934 ext4_ext_truncate+0x159/0x2b0 fs/ext4/extents.c:4440 ext4_truncate+0xa18/0x1180 fs/ext4/inode.c:4146 ext4_setattr+0x119a/0x1bb0 fs/ext4/inode.c:5454 notify_change+0xb9f/0xe70 fs/attr.c:497 do_truncate+0x220/0x310 fs/open.c:65 handle_truncate fs/namei.c:3300 [inline] do_open fs/namei.c:3646 [inline] path_openat+0x29fe/0x3240 fs/namei.c:3799 do_filp_open+0x235/0x490 fs/namei.c:3826 do_sys_openat2+0x13e/0x1d0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_openat fs/open.c:1437 [inline] __se_sys_openat fs/open.c:1432 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1432 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: 0033:0x7fd8b907dca9 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:00007fd8b9e050c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fd8b91abf80 RCX: 00007fd8b907dca9 RDX: 0000000000007a05 RSI: 0000000020000080 RDI: ffffffffffffff9c RBP: 00007fd8b90c947e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001700 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fd8b91abf80 R15: 00007ffd7f9f4de8