bisecting fixing commit since 618d919cae2fcaadc752f27ddac8b939da8b441a building syzkaller on 505ab413c77ce8c6bd4658ea5e68ea2534d47b39 testing commit 618d919cae2fcaadc752f27ddac8b939da8b441a with gcc (GCC) 8.1.0 kernel signature: c2092b5875fe7e775bb04366735458af72547ed2 all runs: crashed: INFO: task hung in aead_recvmsg testing current HEAD 6794862a16ef41f753abd75c03a152836e4c8028 testing commit 6794862a16ef41f753abd75c03a152836e4c8028 with gcc (GCC) 8.1.0 kernel signature: 766b6416930a3107edd9948e2c6ae87ce363fcc1 all runs: crashed: INFO: task hung in aead_recvmsg revisions tested: 2, total time: 25m7.453912328s (build: 11m56.592626583s, test: 12m14.206021651s) the crash still happens on HEAD commit msg: Merge tag 'for-5.5-rc1-kconfig-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux crash: INFO: task hung in aead_recvmsg INFO: task syz-executor.2:7244 blocked for more than 143 seconds. Not tainted 5.5.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28504 7244 7198 0x00000004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x856/0x1910 kernel/sched/core.c:4081 schedule+0xc3/0x2b0 kernel/sched/core.c:4155 schedule_timeout+0x5c4/0xad0 kernel/time/timer.c:1871 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x28b/0x460 kernel/sched/completion.c:136 crypto_wait_req include/linux/crypto.h:569 [inline] _aead_recvmsg crypto/algif_aead.c:309 [inline] aead_recvmsg+0xe7a/0x1ad0 crypto/algif_aead.c:330 sock_recvmsg_nosec net/socket.c:873 [inline] sock_recvmsg+0xf4/0x130 net/socket.c:891 sock_read_iter+0x226/0x3d0 net/socket.c:969 call_read_iter include/linux/fs.h:1896 [inline] do_iter_readv_writev+0x465/0xa70 fs/read_write.c:691 do_iter_read+0x1df/0x590 fs/read_write.c:933 vfs_readv+0xc7/0x130 fs/read_write.c:997 do_readv+0x225/0x2e0 fs/read_write.c:1034 __do_sys_readv fs/read_write.c:1125 [inline] __se_sys_readv fs/read_write.c:1122 [inline] __x64_sys_readv+0x70/0xb0 fs/read_write.c:1122 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458c29 Code: 20 f3 44 0f 7f 40 30 f3 44 0f 7f 48 40 f3 44 0f 7f 50 50 f3 44 0f 7f 58 60 f3 44 0f 7f 60 70 c3 48 81 eb 80 00 00 00 0f 18 86 <40> fe ff ff 0f 18 86 80 fd ff ff c5 fe 6f 46 e0 c5 fe 6f 4e c0 c5 RSP: 002b:00007fcb7b964c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcb7b9656d4 R13: 00000000004c5985 R14: 00000000004d9fe0 R15: 00000000ffffffff INFO: task syz-executor.5:7260 blocked for more than 143 seconds. Not tainted 5.5.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28816 7260 7209 0x00000004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x856/0x1910 kernel/sched/core.c:4081 schedule+0xc3/0x2b0 kernel/sched/core.c:4155 schedule_timeout+0x5c4/0xad0 kernel/time/timer.c:1871 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x28b/0x460 kernel/sched/completion.c:136 crypto_wait_req include/linux/crypto.h:569 [inline] _aead_recvmsg crypto/algif_aead.c:309 [inline] aead_recvmsg+0xe7a/0x1ad0 crypto/algif_aead.c:330 sock_recvmsg_nosec net/socket.c:873 [inline] sock_recvmsg+0xf4/0x130 net/socket.c:891 sock_read_iter+0x226/0x3d0 net/socket.c:969 call_read_iter include/linux/fs.h:1896 [inline] do_iter_readv_writev+0x465/0xa70 fs/read_write.c:691 do_iter_read+0x1df/0x590 fs/read_write.c:933 vfs_readv+0xc7/0x130 fs/read_write.c:997 do_readv+0x225/0x2e0 fs/read_write.c:1034 __do_sys_readv fs/read_write.c:1125 [inline] __se_sys_readv fs/read_write.c:1122 [inline] __x64_sys_readv+0x70/0xb0 fs/read_write.c:1122 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458c29 Code: 20 f3 44 0f 7f 40 30 f3 44 0f 7f 48 40 f3 44 0f 7f 50 50 f3 44 0f 7f 58 60 f3 44 0f 7f 60 70 c3 48 81 eb 80 00 00 00 0f 18 86 <40> fe ff ff 0f 18 86 80 fd ff ff c5 fe 6f 46 e0 c5 fe 6f 4e c0 c5 RSP: 002b:00007fc429adec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc429adf6d4 R13: 00000000004c5985 R14: 00000000004d9fe0 R15: 00000000ffffffff INFO: task syz-executor.1:7265 blocked for more than 144 seconds. Not tainted 5.5.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28816 7265 7200 0x00000004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x856/0x1910 kernel/sched/core.c:4081 schedule+0xc3/0x2b0 kernel/sched/core.c:4155 schedule_timeout+0x5c4/0xad0 kernel/time/timer.c:1871 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x28b/0x460 kernel/sched/completion.c:136 crypto_wait_req include/linux/crypto.h:569 [inline] _aead_recvmsg crypto/algif_aead.c:309 [inline] aead_recvmsg+0xe7a/0x1ad0 crypto/algif_aead.c:330 sock_recvmsg_nosec net/socket.c:873 [inline] sock_recvmsg+0xf4/0x130 net/socket.c:891 sock_read_iter+0x226/0x3d0 net/socket.c:969 call_read_iter include/linux/fs.h:1896 [inline] do_iter_readv_writev+0x465/0xa70 fs/read_write.c:691 do_iter_read+0x1df/0x590 fs/read_write.c:933 vfs_readv+0xc7/0x130 fs/read_write.c:997 do_readv+0x225/0x2e0 fs/read_write.c:1034 __do_sys_readv fs/read_write.c:1125 [inline] __se_sys_readv fs/read_write.c:1122 [inline] __x64_sys_readv+0x70/0xb0 fs/read_write.c:1122 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458c29 Code: 20 f3 44 0f 7f 40 30 f3 44 0f 7f 48 40 f3 44 0f 7f 50 50 f3 44 0f 7f 58 60 f3 44 0f 7f 60 70 c3 48 81 eb 80 00 00 00 0f 18 86 <40> fe ff ff 0f 18 86 80 fd ff ff c5 fe 6f 46 e0 c5 fe 6f 4e c0 c5 RSP: 002b:00007f6c9bea1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6c9bea26d4 R13: 00000000004c5985 R14: 00000000004d9fe0 R15: 00000000ffffffff INFO: task syz-executor.3:7288 blocked for more than 144 seconds. Not tainted 5.5.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28584 7288 7203 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x856/0x1910 kernel/sched/core.c:4081 schedule+0xc3/0x2b0 kernel/sched/core.c:4155 schedule_timeout+0x5c4/0xad0 kernel/time/timer.c:1871 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x28b/0x460 kernel/sched/completion.c:136 crypto_wait_req include/linux/crypto.h:569 [inline] _aead_recvmsg crypto/algif_aead.c:309 [inline] aead_recvmsg+0xe7a/0x1ad0 crypto/algif_aead.c:330 sock_recvmsg_nosec net/socket.c:873 [inline] sock_recvmsg+0xf4/0x130 net/socket.c:891 sock_read_iter+0x226/0x3d0 net/socket.c:969 call_read_iter include/linux/fs.h:1896 [inline] do_iter_readv_writev+0x465/0xa70 fs/read_write.c:691 do_iter_read+0x1df/0x590 fs/read_write.c:933 vfs_readv+0xc7/0x130 fs/read_write.c:997 do_readv+0x225/0x2e0 fs/read_write.c:1034 __do_sys_readv fs/read_write.c:1125 [inline] __se_sys_readv fs/read_write.c:1122 [inline] __x64_sys_readv+0x70/0xb0 fs/read_write.c:1122 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458c29 Code: 20 f3 44 0f 7f 40 30 f3 44 0f 7f 48 40 f3 44 0f 7f 50 50 f3 44 0f 7f 58 60 f3 44 0f 7f 60 70 c3 48 81 eb 80 00 00 00 0f 18 86 <40> fe ff ff 0f 18 86 80 fd ff ff c5 fe 6f 46 e0 c5 fe 6f 4e c0 c5 RSP: 002b:00007f93927c2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f93927c36d4 R13: 00000000004c5985 R14: 00000000004d9fe0 R15: 00000000ffffffff INFO: task syz-executor.0:7295 blocked for more than 144 seconds. Not tainted 5.5.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28312 7295 7206 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x856/0x1910 kernel/sched/core.c:4081 schedule+0xc3/0x2b0 kernel/sched/core.c:4155 schedule_timeout+0x5c4/0xad0 kernel/time/timer.c:1871 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x28b/0x460 kernel/sched/completion.c:136 crypto_wait_req include/linux/crypto.h:569 [inline] _aead_recvmsg crypto/algif_aead.c:309 [inline] aead_recvmsg+0xe7a/0x1ad0 crypto/algif_aead.c:330 sock_recvmsg_nosec net/socket.c:873 [inline] sock_recvmsg+0xf4/0x130 net/socket.c:891 sock_read_iter+0x226/0x3d0 net/socket.c:969 call_read_iter include/linux/fs.h:1896 [inline] do_iter_readv_writev+0x465/0xa70 fs/read_write.c:691 do_iter_read+0x1df/0x590 fs/read_write.c:933 vfs_readv+0xc7/0x130 fs/read_write.c:997 do_readv+0x225/0x2e0 fs/read_write.c:1034 __do_sys_readv fs/read_write.c:1125 [inline] __se_sys_readv fs/read_write.c:1122 [inline] __x64_sys_readv+0x70/0xb0 fs/read_write.c:1122 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458c29 Code: 20 f3 44 0f 7f 40 30 f3 44 0f 7f 48 40 f3 44 0f 7f 50 50 f3 44 0f 7f 58 60 f3 44 0f 7f 60 70 c3 48 81 eb 80 00 00 00 0f 18 86 <40> fe ff ff 0f 18 86 80 fd ff ff c5 fe 6f 46 e0 c5 fe 6f 4e c0 c5 RSP: 002b:00007f536f85cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f536f85d6d4 R13: 00000000004c5985 R14: 00000000004d9fe0 R15: 00000000ffffffff INFO: task syz-executor.4:7293 blocked for more than 145 seconds. Not tainted 5.5.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28584 7293 7205 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x856/0x1910 kernel/sched/core.c:4081 schedule+0xc3/0x2b0 kernel/sched/core.c:4155 schedule_timeout+0x5c4/0xad0 kernel/time/timer.c:1871 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x28b/0x460 kernel/sched/completion.c:136 crypto_wait_req include/linux/crypto.h:569 [inline] _aead_recvmsg crypto/algif_aead.c:309 [inline] aead_recvmsg+0xe7a/0x1ad0 crypto/algif_aead.c:330 sock_recvmsg_nosec net/socket.c:873 [inline] sock_recvmsg+0xf4/0x130 net/socket.c:891 sock_read_iter+0x226/0x3d0 net/socket.c:969 call_read_iter include/linux/fs.h:1896 [inline] do_iter_readv_writev+0x465/0xa70 fs/read_write.c:691 do_iter_read+0x1df/0x590 fs/read_write.c:933 vfs_readv+0xc7/0x130 fs/read_write.c:997 do_readv+0x225/0x2e0 fs/read_write.c:1034 __do_sys_readv fs/read_write.c:1125 [inline] __se_sys_readv fs/read_write.c:1122 [inline] __x64_sys_readv+0x70/0xb0 fs/read_write.c:1122 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458c29 Code: Bad RIP value. RSP: 002b:00007f14409acc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f14409ad6d4 R13: 00000000004c5985 R14: 00000000004d9fe0 R15: 00000000ffffffff INFO: task syz-executor.4:7305 blocked for more than 145 seconds. Not tainted 5.5.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28120 7305 7205 0x00000004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x856/0x1910 kernel/sched/core.c:4081 schedule+0xc3/0x2b0 kernel/sched/core.c:4155 schedule_timeout+0x5c4/0xad0 kernel/time/timer.c:1871 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x28b/0x460 kernel/sched/completion.c:136 crypto_wait_req include/linux/crypto.h:569 [inline] _aead_recvmsg crypto/algif_aead.c:309 [inline] aead_recvmsg+0xe7a/0x1ad0 crypto/algif_aead.c:330 sock_recvmsg_nosec net/socket.c:873 [inline] sock_recvmsg+0xf4/0x130 net/socket.c:891 sock_read_iter+0x226/0x3d0 net/socket.c:969 call_read_iter include/linux/fs.h:1896 [inline] do_iter_readv_writev+0x465/0xa70 fs/read_write.c:691 do_iter_read+0x1df/0x590 fs/read_write.c:933 vfs_readv+0xc7/0x130 fs/read_write.c:997 do_readv+0x225/0x2e0 fs/read_write.c:1034 __do_sys_readv fs/read_write.c:1125 [inline] __se_sys_readv fs/read_write.c:1122 [inline] __x64_sys_readv+0x70/0xb0 fs/read_write.c:1122 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458c29 Code: Bad RIP value. RSP: 002b:00007f144098bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29 RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f144098c6d4 R13: 00000000004c5985 R14: 00000000004d9fe0 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1057: #0: ffffffff8859c5c0 (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x275 kernel/locking/lockdep.c:5334 2 locks held by kworker/u4:5/3509: #0: ffff8880aec37298 (&rq->lock){-.-.}, at: newidle_balance+0x9df/0xe70 kernel/sched/fair.c:10166 #1: ffffffff8859c5c0 (rcu_read_lock){....}, at: __update_idle_core+0x45/0x3f0 kernel/sched/fair.c:5729 1 lock held by rsyslogd/6995: 2 locks held by getty/7085: #0: ffff88809d6ce090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f1d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x17d0 drivers/tty/n_tty.c:2156 2 locks held by getty/7086: #0: ffff888099446090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f412e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x17d0 drivers/tty/n_tty.c:2156 2 locks held by getty/7087: #0: ffff88809490d090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f352e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x17d0 drivers/tty/n_tty.c:2156 2 locks held by getty/7088: #0: ffff8880962bc090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f392e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x17d0 drivers/tty/n_tty.c:2156 2 locks held by getty/7089: #0: ffff8880960e8090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f3d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x17d0 drivers/tty/n_tty.c:2156 2 locks held by getty/7090: #0: ffff8880969bb090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f312e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x17d0 drivers/tty/n_tty.c:2156 2 locks held by getty/7091: #0: ffff8880968cd090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f112e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x17d0 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.2/7244: #0: ffff88808f5b8110 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1526 [inline] #0: ffff88808f5b8110 (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1df/0x4a0 crypto/af_alg.c:759 1 lock held by syz-executor.5/7260: #0: ffff8880a11cd110 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1526 [inline] #0: ffff8880a11cd110 (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1df/0x4a0 crypto/af_alg.c:759 1 lock held by syz-executor.1/7265: #0: ffff88808ee53110 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1526 [inline] #0: ffff88808ee53110 (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1df/0x4a0 crypto/af_alg.c:759 1 lock held by syz-executor.3/7288: #0: ffff8880a1f8d110 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1526 [inline] #0: ffff8880a1f8d110 (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1df/0x4a0 crypto/af_alg.c:759 1 lock held by syz-executor.0/7295: #0: ffff8880a4b7f110 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1526 [inline] #0: ffff8880a4b7f110 (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1df/0x4a0 crypto/af_alg.c:759 1 lock held by syz-executor.4/7293: #0: ffff888090967110 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1526 [inline] #0: ffff888090967110 (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1df/0x4a0 crypto/af_alg.c:759 1 lock held by syz-executor.4/7305: #0: ffff8880a4d23110 (sk_lock-AF_ALG){+.+.}, at: lock_sock include/net/sock.h:1526 [inline] #0: ffff8880a4d23110 (sk_lock-AF_ALG){+.+.}, at: af_alg_wait_for_data+0x1df/0x4a0 crypto/af_alg.c:759 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1057 Comm: khungtaskd Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12d/0x187 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.7+0x4b/0x84 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x18b/0x1b7 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0x611/0xc50 kernel/hung_task.c:289 kthread+0x334/0x3f0 kernel/kthread.c:255 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x12/0x20 arch/x86/include/asm/irqflags.h:60