bisecting fixing commit since 54b4fa6d39551639cb10664f6ac78b01993a1d7e building syzkaller on c8d1cc20df5ca5d9ea437054720fa3cfdfa1f578 testing commit 54b4fa6d39551639cb10664f6ac78b01993a1d7e compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 0ac8e2c3bbea92a4874c70afbc48dc0a0786dd5d193649c0cbe5d1bba4dccad3 all runs: crashed: WARNING in kcm_write_msgs testing current HEAD 5c66974a63046780925e5d99b6dc6631fe2f9a31 testing commit 5c66974a63046780925e5d99b6dc6631fe2f9a31 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 51155b1d057be3debf0ca10c65211a41c5f4db9e49ce34dfc3b45c766e025033 all runs: crashed: WARNING in kcm_write_msgs revisions tested: 2, total time: 32m30.530959078s (build: 24m16.866042719s, test: 6m40.203467056s) the crash still happens on HEAD commit msg: Linux 4.19.202 crash: WARNING in kcm_write_msgs IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready ------------[ cut here ]------------ WARNING: CPU: 0 PID: 7260 at net/kcm/kcmsock.c:629 kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Modules linked in: CPU: 0 PID: 7260 Comm: syz-executor.1 Not tainted 4.19.202-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Code: c7 c7 60 cb d0 87 4c 89 5d d0 e8 c3 30 ec ff 0f 0b 4c 8b 5d d0 e9 d6 bf 5f ff 48 c7 c7 60 cb d0 87 4c 89 5d d0 e8 a8 30 ec ff <0f> 0b 8b 85 7c ff ff ff ba ea ff ff ff 4c 8b 5d d0 89 45 c4 e9 30 RSP: 0018:ffff8881dcfef8f8 EFLAGS: 00010282 RAX: 0000000000000024 RBX: ffff8881d60a7640 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8767b380 RDI: ffffffff8a1889a0 RBP: ffff8881dcfef9b8 R08: ffffed103ed05079 R09: ffffed103ed05078 R10: ffffed103ed05078 R11: ffff8881f68283c7 R12: 00000000000000c0 R13: ffff8881d6644d40 R14: ffff8881cd82e040 R15: ffff8881d60a7580 FS: 00007f03031e4700(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000202bf002 CR3: 00000001d7b58005 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kcm_sendmsg+0x1897/0x25b0 net/kcm/kcmsock.c:1035 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:661 sock_write_iter+0x215/0x420 net/socket.c:966 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4641a9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f03031e4198 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000c4c RCX: 00000000004641a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000053bf00 R13: 00007f03031e46bc R14: 00000000ffffffff R15: 0000000000000003 irq event stamp: 8576 hardirqs last enabled at (8575): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (8575): [] _raw_spin_unlock_irq+0x27/0x80 kernel/locking/spinlock.c:192 hardirqs last disabled at (8576): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (8570): [] __do_softirq+0x62d/0x919 kernel/softirq.c:318 softirqs last disabled at (8535): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (8535): [] irq_exit+0x17f/0x1c0 kernel/softirq.c:412 ---[ end trace 7bb15b5d63c822e7 ]--- KCM: Hard failure on kcm_write_msgs ------------[ cut here ]------------ WARNING: CPU: 0 PID: 7456 at net/kcm/kcmsock.c:629 kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Modules linked in: CPU: 0 PID: 7456 Comm: syz-executor.4 Tainted: G W 4.19.202-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Code: c7 c7 60 cb d0 87 4c 89 5d d0 e8 c3 30 ec ff 0f 0b 4c 8b 5d d0 e9 d6 bf 5f ff 48 c7 c7 60 cb d0 87 4c 89 5d d0 e8 a8 30 ec ff <0f> 0b 8b 85 7c ff ff ff ba ea ff ff ff 4c 8b 5d d0 89 45 c4 e9 30 RSP: 0018:ffff8881d0e378f8 EFLAGS: 00010282 RAX: 0000000000000024 RBX: ffff8881f4ba2840 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8767b380 RDI: ffffffff8a1889a0 RBP: ffff8881d0e379b8 R08: ffffed103ed05079 R09: ffffed103ed05078 R10: ffffed103ed05078 R11: ffff8881f68283c7 R12: 00000000000000c0 R13: ffff8881d088c140 R14: ffff8881d49b91c0 R15: ffff8881f4ba2780 FS: 00007f29cceca700(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020124040 CR3: 00000001f4675001 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kcm_sendmsg+0x1897/0x25b0 net/kcm/kcmsock.c:1035 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:661 sock_write_iter+0x215/0x420 net/socket.c:966 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4641a9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f29cceca198 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000c4c RCX: 00000000004641a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000053bf00 R13: 00007f29cceca6bc R14: 00000000ffffffff R15: 0000000000000003 irq event stamp: 8580 hardirqs last enabled at (8579): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (8579): [] _raw_spin_unlock_irq+0x27/0x80 kernel/locking/spinlock.c:192 hardirqs last disabled at (8580): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (8574): [] __do_softirq+0x62d/0x919 kernel/softirq.c:318 softirqs last disabled at (8467): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (8467): [] irq_exit+0x17f/0x1c0 kernel/softirq.c:412 ---[ end trace 7bb15b5d63c822e8 ]--- KCM: Hard failure on kcm_write_msgs ------------[ cut here ]------------ WARNING: CPU: 1 PID: 7539 at net/kcm/kcmsock.c:629 kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Modules linked in: CPU: 1 PID: 7539 Comm: syz-executor.5 Tainted: G W 4.19.202-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Code: c7 c7 60 cb d0 87 4c 89 5d d0 e8 c3 30 ec ff 0f 0b 4c 8b 5d d0 e9 d6 bf 5f ff 48 c7 c7 60 cb d0 87 4c 89 5d d0 e8 a8 30 ec ff <0f> 0b 8b 85 7c ff ff ff ba ea ff ff ff 4c 8b 5d d0 89 45 c4 e9 30 RSP: 0018:ffff8881db0f78f8 EFLAGS: 00010282 RAX: 0000000000000024 RBX: ffff8881e7ec28c0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8767b380 RDI: ffffffff8a1889a0 RBP: ffff8881db0f79b8 R08: ffffed103ed25079 R09: ffffed103ed25078 R10: ffffed103ed25078 R11: ffff8881f69283c7 R12: 00000000000000c0 R13: ffff8881ed9486c0 R14: ffff8881f5771080 R15: ffff8881e7ec2800 FS: 00007fa50df43700(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000202bf000 CR3: 00000001d50df005 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kcm_sendmsg+0x1897/0x25b0 net/kcm/kcmsock.c:1035 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:661 sock_write_iter+0x215/0x420 net/socket.c:966 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4641a9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa50df43198 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000c4c RCX: 00000000004641a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000053bf00 R13: 00007fa50df436bc R14: 00000000ffffffff R15: 0000000000000003 irq event stamp: 5660 hardirqs last enabled at (5659): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (5659): [] _raw_spin_unlock_irq+0x27/0x80 kernel/locking/spinlock.c:192 hardirqs last disabled at (5660): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (5646): [] spin_unlock_bh include/linux/spinlock.h:374 [inline] softirqs last enabled at (5646): [] release_sock+0x11f/0x180 net/core/sock.c:2892 softirqs last disabled at (5644): [] spin_lock_bh include/linux/spinlock.h:334 [inline] softirqs last disabled at (5644): [] release_sock+0x1b/0x180 net/core/sock.c:2879 ---[ end trace 7bb15b5d63c822e9 ]--- KCM: Hard failure on kcm_write_msgs ------------[ cut here ]------------ WARNING: CPU: 0 PID: 7581 at net/kcm/kcmsock.c:629 kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Modules linked in: CPU: 0 PID: 7581 Comm: syz-executor.3 Tainted: G W 4.19.202-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Code: c7 c7 60 cb d0 87 4c 89 5d d0 e8 c3 30 ec ff 0f 0b 4c 8b 5d d0 e9 d6 bf 5f ff 48 c7 c7 60 cb d0 87 4c 89 5d d0 e8 a8 30 ec ff <0f> 0b 8b 85 7c ff ff ff ba ea ff ff ff 4c 8b 5d d0 89 45 c4 e9 30 RSP: 0018:ffff8881d82c78f8 EFLAGS: 00010282 RAX: 0000000000000024 RBX: ffff8881ed03bb80 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8767b380 RDI: ffffffff8a1889a0 RBP: ffff8881d82c79b8 R08: ffffed103ed05079 R09: ffffed103ed05078 R10: ffffed103ed05078 R11: ffff8881f68283c7 R12: 00000000000000c0 R13: ffff8881d2316180 R14: ffff8881d2251380 R15: ffff8881ed03bac0 FS: 00007fe82dd3a700(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000202bf002 CR3: 00000001eee02006 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kcm_sendmsg+0x1897/0x25b0 net/kcm/kcmsock.c:1035 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:661 sock_write_iter+0x215/0x420 net/socket.c:966 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4641a9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe82dd3a198 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000c4c RCX: 00000000004641a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000053bf00 R13: 00007fe82dd3a6bc R14: 00000000ffffffff R15: 0000000000000003 irq event stamp: 8908 hardirqs last enabled at (8907): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (8907): [] _raw_spin_unlock_irq+0x27/0x80 kernel/locking/spinlock.c:192 hardirqs last disabled at (8908): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (8892): [] spin_unlock_bh include/linux/spinlock.h:374 [inline] softirqs last enabled at (8892): [] release_sock+0x11f/0x180 net/core/sock.c:2892 softirqs last disabled at (8890): [] spin_lock_bh include/linux/spinlock.h:334 [inline] softirqs last disabled at (8890): [] release_sock+0x1b/0x180 net/core/sock.c:2879 ---[ end trace 7bb15b5d63c822ea ]--- ------------[ cut here ]------------ WARNING: CPU: 0 PID: 7617 at net/kcm/kcmsock.c:629 kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Modules linked in: CPU: 0 PID: 7617 Comm: syz-executor.4 Tainted: G W 4.19.202-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Code: c7 c7 60 cb d0 87 4c 89 5d d0 e8 c3 30 ec ff 0f 0b 4c 8b 5d d0 e9 d6 bf 5f ff 48 c7 c7 60 cb d0 87 4c 89 5d d0 e8 a8 30 ec ff <0f> 0b 8b 85 7c ff ff ff ba ea ff ff ff 4c 8b 5d d0 89 45 c4 e9 30 RSP: 0018:ffff8881cf5978f8 EFLAGS: 00010282 RAX: 0000000000000024 RBX: ffff8881ef1e8100 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8767b380 RDI: ffffffff8a1889a0 RBP: ffff8881cf5979b8 R08: ffffed103ed05079 R09: ffffed103ed05078 R10: ffffed103ed05078 R11: ffff8881f68283c7 R12: 00000000000000c0 R13: ffff8881e89938c0 R14: ffff8881d2250e00 R15: ffff8881ef1e8040 FS: 00007f29cceca700(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000940004 CR3: 00000001d715a006 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kcm_sendmsg+0x1897/0x25b0 net/kcm/kcmsock.c:1035 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:661 sock_write_iter+0x215/0x420 net/socket.c:966 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4641a9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f29cceca198 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000c4c RCX: 00000000004641a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000053bf00 R13: 00007f29cceca6bc R14: 00000000ffffffff R15: 0000000000000003 irq event stamp: 8142 hardirqs last enabled at (8141): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (8141): [] _raw_spin_unlock_irq+0x27/0x80 kernel/locking/spinlock.c:192 hardirqs last disabled at (8142): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (8136): [] __do_softirq+0x62d/0x919 kernel/softirq.c:318 softirqs last disabled at (8043): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (8043): [] irq_exit+0x17f/0x1c0 kernel/softirq.c:412 ---[ end trace 7bb15b5d63c822eb ]--- KCM: Hard failure on kcm_write_msgs KCM: Hard failure on kcm_write_msgs ------------[ cut here ]------------ WARNING: CPU: 1 PID: 7693 at net/kcm/kcmsock.c:629 kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Modules linked in: CPU: 1 PID: 7693 Comm: syz-executor.4 Tainted: G W 4.19.202-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Code: c7 c7 60 cb d0 87 4c 89 5d d0 e8 c3 30 ec ff 0f 0b 4c 8b 5d d0 e9 d6 bf 5f ff 48 c7 c7 60 cb d0 87 4c 89 5d d0 e8 a8 30 ec ff <0f> 0b 8b 85 7c ff ff ff ba ea ff ff ff 4c 8b 5d d0 89 45 c4 e9 30 RSP: 0018:ffff8881d173f8f8 EFLAGS: 00010282 RAX: 0000000000000024 RBX: ffff8881e61a5180 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8767b380 RDI: ffffffff8a1889a0 RBP: ffff8881d173f9b8 R08: ffffed103ed25079 R09: ffffed103ed25078 R10: ffffed103ed25078 R11: ffff8881f69283c7 R12: 00000000000000c0 R13: ffff8881d0f49240 R14: ffff8881e7296e40 R15: ffff8881e61a50c0 FS: 00007f29cceca700(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000940004 CR3: 00000001d717b003 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kcm_sendmsg+0x1897/0x25b0 net/kcm/kcmsock.c:1035 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:661 sock_write_iter+0x215/0x420 net/socket.c:966 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4641a9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f29cceca198 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000c4c RCX: 00000000004641a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000053bf00 R13: 00007f29cceca6bc R14: 00000000ffffffff R15: 0000000000000003 irq event stamp: 7702 hardirqs last enabled at (7701): [] __free_pages_ok+0x630/0xd80 mm/page_alloc.c:1286 hardirqs last disabled at (7702): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (7668): [] spin_unlock_bh include/linux/spinlock.h:374 [inline] softirqs last enabled at (7668): [] release_sock+0x11f/0x180 net/core/sock.c:2892 softirqs last disabled at (7666): [] spin_lock_bh include/linux/spinlock.h:334 [inline] softirqs last disabled at (7666): [] release_sock+0x1b/0x180 net/core/sock.c:2879 ---[ end trace 7bb15b5d63c822ec ]--- KCM: Hard failure on kcm_write_msgs ------------[ cut here ]------------ WARNING: CPU: 1 PID: 7787 at net/kcm/kcmsock.c:629 kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Modules linked in: CPU: 1 PID: 7787 Comm: syz-executor.2 Tainted: G W 4.19.202-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Code: c7 c7 60 cb d0 87 4c 89 5d d0 e8 c3 30 ec ff 0f 0b 4c 8b 5d d0 e9 d6 bf 5f ff 48 c7 c7 60 cb d0 87 4c 89 5d d0 e8 a8 30 ec ff <0f> 0b 8b 85 7c ff ff ff ba ea ff ff ff 4c 8b 5d d0 89 45 c4 e9 30 RSP: 0018:ffff8881dd6b78f8 EFLAGS: 00010282 RAX: 0000000000000024 RBX: ffff8881ed8bb600 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8767b380 RDI: ffffffff8a1889a0 RBP: ffff8881dd6b79b8 R08: ffffed103ed25079 R09: ffffed103ed25078 R10: ffffed103ed25078 R11: ffff8881f69283c7 R12: 00000000000000c0 R13: ffff8881e0c85840 R14: ffff8881e2c27440 R15: ffff8881ed8bb540 FS: 00007fed5328c700(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcc092b908 CR3: 00000001d707e005 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kcm_sendmsg+0x1897/0x25b0 net/kcm/kcmsock.c:1035 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:661 sock_write_iter+0x215/0x420 net/socket.c:966 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4641a9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fed5328c198 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000c4c RCX: 00000000004641a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000053bf00 R13: 00007fed5328c6bc R14: 00000000ffffffff R15: 0000000000000003 irq event stamp: 5852 hardirqs last enabled at (5851): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (5851): [] _raw_spin_unlock_irq+0x27/0x80 kernel/locking/spinlock.c:192 hardirqs last disabled at (5852): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (5846): [] __do_softirq+0x62d/0x919 kernel/softirq.c:318 softirqs last disabled at (5755): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (5755): [] irq_exit+0x17f/0x1c0 kernel/softirq.c:412 ---[ end trace 7bb15b5d63c822ed ]--- KCM: Hard failure on kcm_write_msgs ------------[ cut here ]------------ WARNING: CPU: 0 PID: 7980 at net/kcm/kcmsock.c:629 kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Modules linked in: CPU: 0 PID: 7980 Comm: syz-executor.0 Tainted: G W 4.19.202-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Code: c7 c7 60 cb d0 87 4c 89 5d d0 e8 c3 30 ec ff 0f 0b 4c 8b 5d d0 e9 d6 bf 5f ff 48 c7 c7 60 cb d0 87 4c 89 5d d0 e8 a8 30 ec ff <0f> 0b 8b 85 7c ff ff ff ba ea ff ff ff 4c 8b 5d d0 89 45 c4 e9 30 RSP: 0018:ffff8881c3e078f8 EFLAGS: 00010282 RAX: 0000000000000024 RBX: ffff8881dc9ca600 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8767b380 RDI: ffffffff8a1889a0 RBP: ffff8881c3e079b8 R08: ffffed103ed05079 R09: ffffed103ed05078 R10: ffffed103ed05078 R11: ffff8881f68283c7 R12: 00000000000000c0 R13: ffff8881dc589840 R14: ffff8881dc443600 R15: ffff8881dc9ca540 FS: 00007fcef7173700(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000050d634 CR3: 00000001dc465002 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kcm_sendmsg+0x1897/0x25b0 net/kcm/kcmsock.c:1035 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:661 sock_write_iter+0x215/0x420 net/socket.c:966 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4641a9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcef7173198 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000c4c RCX: 00000000004641a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000053bf00 R13: 00007fcef71736bc R14: 00000000ffffffff R15: 0000000000000003 irq event stamp: 5870 hardirqs last enabled at (5869): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (5869): [] _raw_spin_unlock_irq+0x27/0x80 kernel/locking/spinlock.c:192 hardirqs last disabled at (5870): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (5856): [] spin_unlock_bh include/linux/spinlock.h:374 [inline] softirqs last enabled at (5856): [] release_sock+0x11f/0x180 net/core/sock.c:2892 softirqs last disabled at (5854): [] spin_lock_bh include/linux/spinlock.h:334 [inline] softirqs last disabled at (5854): [] release_sock+0x1b/0x180 net/core/sock.c:2879 ---[ end trace 7bb15b5d63c822ee ]--- ------------[ cut here ]------------ WARNING: CPU: 1 PID: 7994 at net/kcm/kcmsock.c:629 kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Modules linked in: CPU: 1 PID: 7994 Comm: syz-executor.5 Tainted: G W 4.19.202-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Code: c7 c7 60 cb d0 87 4c 89 5d d0 e8 c3 30 ec ff 0f 0b 4c 8b 5d d0 e9 d6 bf 5f ff 48 c7 c7 60 cb d0 87 4c 89 5d d0 e8 a8 30 ec ff <0f> 0b 8b 85 7c ff ff ff ba ea ff ff ff 4c 8b 5d d0 89 45 c4 e9 30 RSP: 0018:ffff8881c3d278f8 EFLAGS: 00010282 RAX: 0000000000000024 RBX: ffff8881dbd10d40 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8767b380 RDI: ffffffff8a1889a0 RBP: ffff8881c3d279b8 R08: ffffed103ed25079 R09: ffffed103ed25078 R10: ffffed103ed25078 R11: ffff8881f69283c7 R12: 00000000000000c0 R13: ffff8881dc589240 R14: ffff8881dbf15380 R15: ffff8881dbd10c80 FS: 00007fa50df22700(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020115000 CR3: 00000001ecd7e002 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: KCM: Hard failure on kcm_write_msgs kcm_sendmsg+0x1897/0x25b0 net/kcm/kcmsock.c:1035 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:661 sock_write_iter+0x215/0x420 net/socket.c:966 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4641a9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa50df22198 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000c4c RCX: 00000000004641a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000053bfa0 R13: 00007fa50df226bc R14: 00000000ffffffff R15: 0000000000000003 irq event stamp: 3222 hardirqs last enabled at (3221): [] console_unlock+0x660/0xde0 kernel/printk/printk.c:2489 hardirqs last disabled at (3222): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (3212): [] spin_unlock_bh include/linux/spinlock.h:374 [inline] softirqs last enabled at (3212): [] release_sock+0x11f/0x180 net/core/sock.c:2892 softirqs last disabled at (3210): [] spin_lock_bh include/linux/spinlock.h:334 [inline] softirqs last disabled at (3210): [] release_sock+0x1b/0x180 net/core/sock.c:2879 ---[ end trace 7bb15b5d63c822ef ]--- KCM: Hard failure on kcm_write_msgs ------------[ cut here ]------------ WARNING: CPU: 1 PID: 8035 at net/kcm/kcmsock.c:629 kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Modules linked in: CPU: 1 PID: 8035 Comm: syz-executor.2 Tainted: G W 4.19.202-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Code: c7 c7 60 cb d0 87 4c 89 5d d0 e8 c3 30 ec ff 0f 0b 4c 8b 5d d0 e9 d6 bf 5f ff 48 c7 c7 60 cb d0 87 4c 89 5d d0 e8 a8 30 ec ff <0f> 0b 8b 85 7c ff ff ff ba ea ff ff ff 4c 8b 5d d0 89 45 c4 e9 30 RSP: 0018:ffff8881c3f878f8 EFLAGS: 00010282 RAX: 0000000000000024 RBX: ffff8881da3ff640 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8767b380 RDI: ffffffff8a1889a0 RBP: ffff8881c3f879b8 R08: ffffed103ed25079 R09: ffffed103ed25078 R10: ffffed103ed25078 R11: ffff8881f69283c7 R12: 00000000000000c0 R13: ffff8881da946d00 R14: ffff8881cd82fbc0 R15: ffff8881da3ff580 FS: 00007fed5328c700(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200ad040 CR3: 00000001dab40003 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kcm_sendmsg+0x1897/0x25b0 net/kcm/kcmsock.c:1035 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:661 sock_write_iter+0x215/0x420 net/socket.c:966 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4641a9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fed5328c198 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000c4c RCX: 00000000004641a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000053bf00 R13: 00007fed5328c6bc R14: 00000000ffffffff R15: 0000000000000003 irq event stamp: 8464 hardirqs last enabled at (8463): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (8463): [] _raw_spin_unlock_irq+0x27/0x80 kernel/locking/spinlock.c:192 hardirqs last disabled at (8464): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (8458): [] __do_softirq+0x62d/0x919 kernel/softirq.c:318 softirqs last disabled at (8371): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (8371): [] irq_exit+0x17f/0x1c0 kernel/softirq.c:412 ---[ end trace 7bb15b5d63c822f0 ]--- KCM: Hard failure on kcm_write_msgs ------------[ cut here ]------------ WARNING: CPU: 1 PID: 8190 at net/kcm/kcmsock.c:629 kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Modules linked in: CPU: 1 PID: 8190 Comm: syz-executor.4 Tainted: G W 4.19.202-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Code: c7 c7 60 cb d0 87 4c 89 5d d0 e8 c3 30 ec ff 0f 0b 4c 8b 5d d0 e9 d6 bf 5f ff 48 c7 c7 60 cb d0 87 4c 89 5d d0 e8 a8 30 ec ff <0f> 0b 8b 85 7c ff ff ff ba ea ff ff ff 4c 8b 5d d0 89 45 c4 e9 30 RSP: 0018:ffff8881cd9d78f8 EFLAGS: 00010282 RAX: 0000000000000024 RBX: ffff8881d5b44340 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8767b380 RDI: ffffffff8a1889a0 RBP: ffff8881cd9d79b8 R08: ffffed103ed25079 R09: ffffed103ed25078 R10: ffffed103ed25078 R11: ffff8881f69283c7 R12: 00000000000000c0 R13: ffff8881d6644740 R14: ffff8881dc7b2600 R15: ffff8881d5b44280 FS: 00007f29cceca700(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000380 CR3: 00000001d10ef003 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kcm_sendmsg+0x1897/0x25b0 net/kcm/kcmsock.c:1035 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:661 sock_write_iter+0x215/0x420 net/socket.c:966 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4641a9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f29cceca198 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000c4c RCX: 00000000004641a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000053bf00 R13: 00007f29cceca6bc R14: 00000000ffffffff R15: 0000000000000003 irq event stamp: 6842 hardirqs last enabled at (6841): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (6841): [] _raw_spin_unlock_irq+0x27/0x80 kernel/locking/spinlock.c:192 hardirqs last disabled at (6842): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (6836): [] __do_softirq+0x62d/0x919 kernel/softirq.c:318 softirqs last disabled at (5747): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (5747): [] irq_exit+0x17f/0x1c0 kernel/softirq.c:412 ---[ end trace 7bb15b5d63c822f1 ]--- KCM: Hard failure on kcm_write_msgs ------------[ cut here ]------------ WARNING: CPU: 1 PID: 8218 at net/kcm/kcmsock.c:629 kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Modules linked in: CPU: 1 PID: 8218 Comm: syz-executor.1 Tainted: G W 4.19.202-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kcm_write_msgs.cold.34+0x5f/0x13e net/kcm/kcmsock.c:629 Code: c7 c7 60 cb d0 87 4c 89 5d d0 e8 c3 30 ec ff 0f 0b 4c 8b 5d d0 e9 d6 bf 5f ff 48 c7 c7 60 cb d0 87 4c 89 5d d0 e8 a8 30 ec ff <0f> 0b 8b 85 7c ff ff ff ba ea ff ff ff 4c 8b 5d d0 89 45 c4 e9 30 RSP: 0018:ffff8881d47178f8 EFLAGS: 00010282 RAX: 0000000000000024 RBX: ffff8881d759b840 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8767b380 RDI: ffffffff8a1889a0 RBP: ffff8881d47179b8 R08: ffffed103ed25079 R09: ffffed103ed25078 R10: ffffed103ed25078 R11: ffff8881f69283c7 R12: 00000000000000c0 R13: ffff8881d6644d40 R14: ffff8881d4bd3980 R15: ffff8881d759b780 FS: 00007f03031e4700(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000380 CR3: 00000001d7d4b004 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: