------------[ cut here ]------------ do not call blocking ops when !TASK_RUNNING; state=1 set at [] prepare_to_wait_exclusive+0x7a/0x2b0 kernel/sched/wait.c:286 WARNING: CPU: 1 PID: 17857 at kernel/sched/core.c:9656 __might_sleep+0x105/0x150 kernel/sched/core.c:9656 Modules linked in: CPU: 1 PID: 17857 Comm: syz-executor.3 Tainted: G W 5.17.0-syzkaller-10107-gd717e4cae0fe #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__might_sleep+0x105/0x150 kernel/sched/core.c:9656 Code: 70 02 00 48 8d bb f0 16 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 75 34 48 8b 93 f0 16 00 00 48 c7 c7 00 df cb 89 e8 96 47 c8 07 <0f> 0b e9 75 ff ff ff e8 cf 29 73 00 e9 26 ff ff ff 89 34 24 e8 d2 RSP: 0018:ffffc900001e0d68 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff88801b943a00 RCX: 0000000000000000 RDX: ffff88801b943a00 RSI: ffffffff815fce18 RDI: fffff5200003c19f RBP: ffffffff8a2479c0 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff815f77ee R11: 0000000000000000 R12: 00000000000002fe R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fc5ee4c1700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d43a000 CR3: 0000000028515000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: blk_release_queue+0x1f/0x320 block/blk-sysfs.c:766 kobject_cleanup lib/kobject.c:705 [inline] kobject_release lib/kobject.c:736 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:753 blkg_free.part.0+0x112/0x1f0 block/blk-cgroup.c:86 blkg_free block/blk-cgroup.c:78 [inline] __blkg_release+0x105/0x160 block/blk-cgroup.c:102 rcu_do_batch kernel/rcu/tree.c:2535 [inline] rcu_core+0x7b1/0x1880 kernel/rcu/tree.c:2786 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:crng_make_state+0x361/0x770 drivers/char/random.c:426 Code: 97 25 fd 48 85 ed 0f 85 6e 02 00 00 e8 f8 94 25 fd 31 ff 48 89 de e8 7e 97 25 fd 48 85 db 74 06 e8 e4 94 25 fd fb 48 83 c4 18 <5b> 5d 41 5c 41 5d 41 5e 41 5f e9 d0 94 25 fd e8 cb 94 25 fd 49 8d RSP: 0018:ffffc9001595f2e0 EFLAGS: 00000292 RAX: 0000000000040000 RBX: 0000000000000200 RCX: ffffc9000b512000 RDX: 0000000000040000 RSI: ffffffff8453068c RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff84530682 R11: 00000000d11929bc R12: ffff8880b9d36f28 R13: 0000000000000001 R14: ffffc9001595f338 R15: ffff88807a000b78 _get_random_bytes.part.0+0x95/0x1a0 drivers/char/random.c:490 _get_random_bytes drivers/char/random.c:486 [inline] get_random_bytes+0x6a/0xd0 drivers/char/random.c:527 sctp_transport_init net/sctp/transport.c:83 [inline] sctp_transport_new+0x56e/0x720 net/sctp/transport.c:101 sctp_assoc_add_peer+0x28f/0x14a0 net/sctp/associola.c:619 sctp_process_param net/sctp/sm_make_chunk.c:2576 [inline] sctp_process_init+0x23f1/0x2a30 net/sctp/sm_make_chunk.c:2396 sctp_sf_do_unexpected_init.isra.0+0xb99/0x1700 net/sctp/sm_statefuns.c:1612 sctp_do_sm+0x179/0x4f00 net/sctp/sm_sideeffect.c:1163 sctp_assoc_bh_rcv+0x386/0x6c0 net/sctp/associola.c:1054 sctp_inq_push+0x1d2/0x270 net/sctp/inqueue.c:80 sctp_backlog_rcv+0x196/0x5a0 net/sctp/input.c:344 sk_backlog_rcv include/net/sock.h:1051 [inline] __release_sock+0x134/0x3b0 net/core/sock.c:2794 release_sock+0x54/0x1b0 net/core/sock.c:3327 sctp_wait_for_connect+0x1cb/0x5d0 net/sctp/socket.c:9316 __sctp_connect+0x9a6/0xc30 net/sctp/socket.c:1244 sctp_connect net/sctp/socket.c:4808 [inline] sctp_inet_connect+0x15e/0x200 net/sctp/socket.c:4823 __sys_connect_file+0x14f/0x190 net/socket.c:1900 __sys_connect+0x161/0x190 net/socket.c:1917 __do_sys_connect net/socket.c:1927 [inline] __se_sys_connect net/socket.c:1924 [inline] __x64_sys_connect+0x6f/0xb0 net/socket.c:1924 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fc5ed289049 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc5ee4c1168 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007fc5ed39bf60 RCX: 00007fc5ed289049 RDX: 000000000000001c RSI: 00000000200000c0 RDI: 0000000000000004 RBP: 00007fc5ed2e308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd84fe32ef R14: 00007fc5ee4c1300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 97 xchg %eax,%edi 1: 25 fd 48 85 ed and $0xed8548fd,%eax 6: 0f 85 6e 02 00 00 jne 0x27a c: e8 f8 94 25 fd callq 0xfd259509 11: 31 ff xor %edi,%edi 13: 48 89 de mov %rbx,%rsi 16: e8 7e 97 25 fd callq 0xfd259799 1b: 48 85 db test %rbx,%rbx 1e: 74 06 je 0x26 20: e8 e4 94 25 fd callq 0xfd259509 25: fb sti 26: 48 83 c4 18 add $0x18,%rsp * 2a: 5b pop %rbx <-- trapping instruction 2b: 5d pop %rbp 2c: 41 5c pop %r12 2e: 41 5d pop %r13 30: 41 5e pop %r14 32: 41 5f pop %r15 34: e9 d0 94 25 fd jmpq 0xfd259509 39: e8 cb 94 25 fd callq 0xfd259509 3e: 49 rex.WB 3f: 8d .byte 0x8d