====================================================== WARNING: possible circular locking dependency detected 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 Not tainted ------------------------------------------------------ syz.1.1432/12578 is trying to acquire lock: ffffaf802c540a30 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: touch_work_lockdep_map kernel/workqueue.c:3919 [inline] ffffaf802c540a30 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: start_flush_work kernel/workqueue.c:4176 [inline] ffffaf802c540a30 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: __flush_work+0x474/0xd4e kernel/workqueue.c:4208 but task is already holding lock: ffffaf802d7f8258 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x372/0x5e8 net/smc/af_smc.c:340 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (sk_lock-AF_SMC/1){+.+.}-{0:0}: lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1ac/0x448 kernel/locking/lockdep.c:5825 lock_sock_nested+0x38/0xf6 net/core/sock.c:3733 smc_listen_out+0x208/0x46a net/smc/af_smc.c:1927 smc_listen_out_connected net/smc/af_smc.c:1947 [inline] smc_listen_work+0x590/0x5232 net/smc/af_smc.c:2469 process_one_work+0x96a/0x1f32 kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x5ce/0xde8 kernel/workqueue.c:3400 kthread+0x39c/0x7d4 kernel/kthread.c:463 ret_from_fork_kernel+0x2a/0xbb4 arch/riscv/kernel/process.c:214 ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:327 -> #0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}: check_noncircular+0x132/0x146 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x12b2/0x24ea kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1ac/0x448 kernel/locking/lockdep.c:5825 touch_work_lockdep_map kernel/workqueue.c:3922 [inline] start_flush_work kernel/workqueue.c:4176 [inline] __flush_work+0x4a4/0xd4e kernel/workqueue.c:4208 __cancel_work_sync+0x136/0x15a kernel/workqueue.c:4364 cancel_work_sync+0x1c/0x26 kernel/workqueue.c:4401 smc_clcsock_release+0x6c/0xf2 net/smc/smc_close.c:29 __smc_release+0x4e8/0x776 net/smc/af_smc.c:305 smc_close_non_accepted+0xd6/0x21e net/smc/af_smc.c:1858 smc_close_cleanup_listen net/smc/smc_close.c:45 [inline] smc_close_active+0x904/0xfdc net/smc/smc_close.c:225 __smc_release+0x556/0x776 net/smc/af_smc.c:281 smc_release+0x1f6/0x5e8 net/smc/af_smc.c:348 __sock_release+0xa4/0x246 net/socket.c:649 sock_close+0x1e/0x2a net/socket.c:1439 __fput+0x382/0xa8c fs/file_table.c:468 ____fput+0x1c/0x26 fs/file_table.c:496 task_work_run+0x16a/0x25e kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0x118/0x134 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_trap_ecall_u+0x3f0/0x530 arch/riscv/kernel/traps.c:357 handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sk_lock-AF_SMC/1); lock((work_completion)(&new_smc->smc_listen_work)); lock(sk_lock-AF_SMC/1); lock((work_completion)(&new_smc->smc_listen_work)); *** DEADLOCK *** 3 locks held by syz.1.1432/12578: #0: ffffaf801597d288 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffffaf801597d288 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: __sock_release+0x82/0x246 net/socket.c:648 #1: ffffaf802d7f8258 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x372/0x5e8 net/smc/af_smc.c:340 #2: ffffffff883dd9a0 (rcu_read_lock){....}-{1:3}, at: __flush_work+0xea/0xd4e kernel/workqueue.c:4205 stack backtrace: CPU: 0 UID: 0 PID: 12578 Comm: syz.1.1432 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT Hardware name: riscv-virtio,qemu (DT) Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:132 [] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:138 [] __dump_stack lib/dump_stack.c:94 [inline] [] dump_stack_lvl+0x12e/0x1a6 lib/dump_stack.c:120 [] dump_stack+0x1c/0x24 lib/dump_stack.c:129 [] print_circular_bug+0x254/0x29a kernel/locking/lockdep.c:2043 [] check_noncircular+0x132/0x146 kernel/locking/lockdep.c:2175 [] check_prev_add kernel/locking/lockdep.c:3165 [inline] [] check_prevs_add kernel/locking/lockdep.c:3284 [inline] [] validate_chain kernel/locking/lockdep.c:3908 [inline] [] __lock_acquire+0x12b2/0x24ea kernel/locking/lockdep.c:5237 [] lock_acquire kernel/locking/lockdep.c:5868 [inline] [] lock_acquire+0x1ac/0x448 kernel/locking/lockdep.c:5825 [] touch_work_lockdep_map kernel/workqueue.c:3922 [inline] [] start_flush_work kernel/workqueue.c:4176 [inline] [] __flush_work+0x4a4/0xd4e kernel/workqueue.c:4208 [] __cancel_work_sync+0x136/0x15a kernel/workqueue.c:4364 [] cancel_work_sync+0x1c/0x26 kernel/workqueue.c:4401 [] smc_clcsock_release+0x6c/0xf2 net/smc/smc_close.c:29 [] __smc_release+0x4e8/0x776 net/smc/af_smc.c:305 [] smc_close_non_accepted+0xd6/0x21e net/smc/af_smc.c:1858 [] smc_close_cleanup_listen net/smc/smc_close.c:45 [inline] [] smc_close_active+0x904/0xfdc net/smc/smc_close.c:225 [] __smc_release+0x556/0x776 net/smc/af_smc.c:281 [] smc_release+0x1f6/0x5e8 net/smc/af_smc.c:348 [] __sock_release+0xa4/0x246 net/socket.c:649 [] sock_close+0x1e/0x2a net/socket.c:1439 [] __fput+0x382/0xa8c fs/file_table.c:468 [] ____fput+0x1c/0x26 fs/file_table.c:496 [] task_work_run+0x16a/0x25e kernel/task_work.c:227 [] resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] [] exit_to_user_mode_loop+0x118/0x134 kernel/entry/common.c:43 [] exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] [] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] [] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] [] do_trap_ecall_u+0x3f0/0x530 arch/riscv/kernel/traps.c:357 [] handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197