Warning: Permanently added '10.128.0.96' (ECDSA) to the list of known hosts.
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syzkaller login: [ 74.339320][ C0]
[ 74.341794][ C0] ======================================================
[ 74.348792][ C0] WARNING: possible circular locking dependency detected
[ 74.355783][ C0] 5.12.0-rc8-syzkaller #0 Not tainted
[ 74.361177][ C0] ------------------------------------------------------
[ 74.368189][ C0] syz-executor044/8536 is trying to acquire lock:
[ 74.374582][ C0] ffff8880183933a0 (slock-AF_INET6){+.-.}-{2:2}, at: sctp_addr_wq_timeout_handler+0x1a1/0x550
[ 74.384832][ C0]
[ 74.384832][ C0] but task is already holding lock:
[ 74.392213][ C0] ffffffff8d659620 (&net->sctp.addr_wq_lock){+.-.}-{2:2}, at: sctp_addr_wq_timeout_handler+0x38/0x550
[ 74.403144][ C0]
[ 74.403144][ C0] which lock already depends on the new lock.
[ 74.403144][ C0]
[ 74.413520][ C0]
[ 74.413520][ C0] the existing dependency chain (in reverse order) is:
[ 74.422543][ C0]
[ 74.422543][ C0] -> #1 (&net->sctp.addr_wq_lock){+.-.}-{2:2}:
[ 74.430875][ C0] _raw_spin_lock_bh+0x2f/0x40
[ 74.436198][ C0] sctp_destroy_sock+0x204/0x440
[ 74.441636][ C0] sctp_v6_destroy_sock+0x11/0x20
[ 74.447159][ C0] sk_common_release+0x64/0x390
[ 74.452563][ C0] sctp_close+0x4da/0x940
[ 74.457409][ C0] inet_release+0x12e/0x280
[ 74.462410][ C0] inet6_release+0x4c/0x70
[ 74.467327][ C0] __sock_release+0xcd/0x280
[ 74.472429][ C0] sock_close+0x18/0x20
[ 74.477212][ C0] __fput+0x288/0x920
[ 74.481698][ C0] task_work_run+0xdd/0x1a0
[ 74.486703][ C0] do_exit+0xbfc/0x2a60
[ 74.491361][ C0] do_group_exit+0x125/0x310
[ 74.496453][ C0] __x64_sys_exit_group+0x3a/0x50
[ 74.502001][ C0] do_syscall_64+0x2d/0x70
[ 74.507026][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 74.513529][ C0]
[ 74.513529][ C0] -> #0 (slock-AF_INET6){+.-.}-{2:2}:
[ 74.521060][ C0] __lock_acquire+0x2b14/0x54c0
[ 74.526429][ C0] lock_acquire+0x1ab/0x740
[ 74.531430][ C0] _raw_spin_lock+0x2a/0x40
[ 74.536431][ C0] sctp_addr_wq_timeout_handler+0x1a1/0x550
[ 74.542836][ C0] call_timer_fn+0x1a5/0x6b0
[ 74.547934][ C0] __run_timers.part.0+0x67c/0xa50
[ 74.553544][ C0] run_timer_softirq+0xb3/0x1d0
[ 74.558892][ C0] __do_softirq+0x29b/0x9f6
[ 74.563897][ C0] irq_exit_rcu+0x134/0x200
[ 74.568897][ C0] sysvec_apic_timer_interrupt+0x93/0xc0
[ 74.575043][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20
[ 74.581524][ C0] _raw_spin_unlock_irqrestore+0x38/0x70
[ 74.587654][ C0] debug_check_no_obj_freed+0x20c/0x420
[ 74.593698][ C0] slab_free_freelist_hook+0x147/0x210
[ 74.599660][ C0] kmem_cache_free+0x8a/0x740
[ 74.604841][ C0] exit_fs+0x123/0x170
[ 74.609410][ C0] do_exit+0xbca/0x2a60
[ 74.614074][ C0] do_group_exit+0x125/0x310
[ 74.619163][ C0] __x64_sys_exit_group+0x3a/0x50
[ 74.624709][ C0] do_syscall_64+0x2d/0x70
[ 74.629627][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 74.636040][ C0]
[ 74.636040][ C0] other info that might help us debug this:
[ 74.636040][ C0]
[ 74.646239][ C0] Possible unsafe locking scenario:
[ 74.646239][ C0]
[ 74.653661][ C0] CPU0 CPU1
[ 74.659011][ C0] ---- ----
[ 74.664361][ C0] lock(&net->sctp.addr_wq_lock);
[ 74.669450][ C0] lock(slock-AF_INET6);
[ 74.676278][ C0] lock(&net->sctp.addr_wq_lock);
[ 74.683880][ C0] lock(slock-AF_INET6);
[ 74.688185][ C0]
[ 74.688185][ C0] *** DEADLOCK ***
[ 74.688185][ C0]
[ 74.696301][ C0] 2 locks held by syz-executor044/8536:
[ 74.701818][ C0] #0: ffffc90000007d78 ((&net->sctp.addr_wq_timer)){+.-.}-{0:0}, at: call_timer_fn+0xd5/0x6b0
[ 74.712169][ C0] #1: ffffffff8d659620 (&net->sctp.addr_wq_lock){+.-.}-{2:2}, at: sctp_addr_wq_timeout_handler+0x38/0x550
[ 74.723551][ C0]
[ 74.723551][ C0] stack backtrace:
[ 74.729422][ C0] CPU: 0 PID: 8536 Comm: syz-executor044 Not tainted 5.12.0-rc8-syzkaller #0
[ 74.738166][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 74.748197][ C0] Call Trace:
[ 74.751457][ C0]
[ 74.754282][ C0] dump_stack+0x141/0x1d7
[ 74.758606][ C0] check_noncircular+0x25f/0x2e0
[ 74.763538][ C0] ? print_circular_bug+0x480/0x480
[ 74.768718][ C0] ? lockdep_lock+0xc6/0x200
[ 74.773287][ C0] ? call_rcu_zapped+0xb0/0xb0
[ 74.778044][ C0] __lock_acquire+0x2b14/0x54c0
[ 74.782878][ C0] ? lockdep_hardirqs_on_prepare+0x400/0x400
[ 74.788840][ C0] lock_acquire+0x1ab/0x740
[ 74.793323][ C0] ? sctp_addr_wq_timeout_handler+0x1a1/0x550
[ 74.799372][ C0] ? lock_release+0x720/0x720
[ 74.804036][ C0] ? do_raw_spin_lock+0x120/0x2b0
[ 74.809040][ C0] ? rwlock_bug.part.0+0x90/0x90
[ 74.813957][ C0] ? __sanitizer_cov_trace_switch+0x63/0xf0
[ 74.819834][ C0] _raw_spin_lock+0x2a/0x40
[ 74.824336][ C0] ? sctp_addr_wq_timeout_handler+0x1a1/0x550
[ 74.830471][ C0] sctp_addr_wq_timeout_handler+0x1a1/0x550
[ 74.836352][ C0] ? sctp_defaults_exit+0x510/0x510
[ 74.841527][ C0] call_timer_fn+0x1a5/0x6b0
[ 74.846097][ C0] ? add_timer_on+0x4a0/0x4a0
[ 74.850755][ C0] ? lock_downgrade+0x6e0/0x6e0
[ 74.855595][ C0] ? _raw_spin_unlock_irq+0x1f/0x40
[ 74.860775][ C0] ? sctp_defaults_exit+0x510/0x510
[ 74.865960][ C0] __run_timers.part.0+0x67c/0xa50
[ 74.871050][ C0] ? call_timer_fn+0x6b0/0x6b0
[ 74.875791][ C0] ? kvm_sched_clock_read+0x14/0x40
[ 74.880966][ C0] ? sched_clock+0x2a/0x40
[ 74.885365][ C0] ? sched_clock_cpu+0x18/0x1f0
[ 74.890194][ C0] run_timer_softirq+0xb3/0x1d0
[ 74.895044][ C0] __do_softirq+0x29b/0x9f6
[ 74.899532][ C0] irq_exit_rcu+0x134/0x200
[ 74.904019][ C0] sysvec_apic_timer_interrupt+0x93/0xc0
[ 74.909632][ C0]
[ 74.912545][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20
[ 74.918506][ C0] RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70
[ 74.924902][ C0] Code: 74 24 10 e8 4a f9 53 f8 48 89 ef e8 82 af 54 f8 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 63 7d 48 f8 65 8b 05 0c 48 fc 76 85 c0 74 0a 5b 5d c3 e8 d0 3c
[ 74.944485][ C0] RSP: 0018:ffffc9000173fc50 EFLAGS: 00000206
[ 74.950531][ C0] RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff1b89e11
[ 74.958494][ C0] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
[ 74.966454][ C0] RBP: ffffffff9006cf00 R08: 0000000000000001 R09: 0000000000000001
[ 74.974411][ C0] R10: ffffffff8179e4c8 R11: 000000000000003f R12: 1ffffffff200d9df
[ 74.982368][ C0] R13: 0000000000000000 R14: dead000000000100 R15: dffffc0000000000
[ 74.990338][ C0] ? trace_hardirqs_on+0x38/0x1c0
[ 74.995362][ C0] debug_check_no_obj_freed+0x20c/0x420
[ 75.000893][ C0] ? slab_free_freelist_hook+0xee/0x210
[ 75.006431][ C0] slab_free_freelist_hook+0x147/0x210
[ 75.011873][ C0] kmem_cache_free+0x8a/0x740
[ 75.016528][ C0] ? exit_fs+0x123/0x170
[ 75.020751][ C0] ? dput+0x1de/0xbc0
[ 75.024724][ C0] exit_fs+0x123/0x170
[ 75.028771][ C0] do_exit+0xbca/0x2a60
[ 75.032935][ C0] ? mm_update_next_owner+0x7a0/0x7a0
[ 75.038313][ C0] ? lock_downgrade+0x6e0/0x6e0
[ 75.043153][ C0] do_group_exit+0x125/0x310
[ 75.047746][ C0] __x64_sys_exit_group+0x3a/0x50
[ 75.052753][ C0] do_syscall_64+0x2d/0x70
[ 75.057155][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 75.063029][ C0] RIP: 0033:0x43ea79
[ 75.066903][ C0] Code: Unable to access opcode bytes at RIP 0x43ea4f.
[ 75.073717][ C0] RSP: 002b:00007ffdbc348058 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[ 75.082108][ C0] RAX: ffffffffffffffda RBX: 00000000004b0330 RCX: 000000000043ea79
[ 75.090159][ C0] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
[ 75.098112][ C0] RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000001
[ 75.106064][ C0] R10: 0000000000000001 R11: 0000000000000246 R12: 00000000004b0330
[ 75.114012][ C0] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001