bisecting fixing commit since 14cfdbd39e316efd91ae6e403ef8211f0b022603 building syzkaller on 68660b21c27c417771037b3f1fe4aa072cfdeef9 testing commit 14cfdbd39e316efd91ae6e403ef8211f0b022603 with gcc (GCC) 8.4.1 20210217 kernel signature: 2baa531c1e7b8c0425ed3c711f9c868ba57bdd9f3187f311c78d4b23a02e54e9 run #0: crashed: kernel BUG in sctp_do_sm run #1: crashed: kernel BUG in sctp_do_sm run #2: crashed: kernel BUG in sctp_do_sm run #3: crashed: kernel BUG in sctp_do_sm run #4: crashed: kernel BUG in sctp_do_sm run #5: crashed: kernel BUG in sctp_do_sm run #6: crashed: kernel BUG in sctp_do_sm run #7: crashed: kernel BUG in sctp_do_sm run #8: crashed: kernel BUG in sctp_do_sm run #9: crashed: kernel BUG in sctp_do_sm run #10: crashed: kernel BUG in sctp_do_sm run #11: crashed: kernel BUG in sctp_do_sm run #12: crashed: kernel BUG in sctp_do_sm run #13: OK run #14: OK run #15: OK run #16: OK run #17: OK run #18: OK run #19: OK testing current HEAD 2965db2e004cf9c92b87c1f559e9812c0ae878c1 testing commit 2965db2e004cf9c92b87c1f559e9812c0ae878c1 with gcc (GCC) 8.4.1 20210217 kernel signature: fcb0b91a17468af6160647e2948b367d4ffbbc63ce30093eb75c88f28aa02f92 run #0: crashed: kernel BUG in sctp_do_sm run #1: crashed: kernel BUG in sctp_do_sm run #2: crashed: kernel BUG in sctp_do_sm run #3: crashed: kernel BUG in sctp_do_sm run #4: crashed: kernel BUG in sctp_do_sm run #5: crashed: kernel BUG in sctp_do_sm run #6: crashed: kernel BUG in sctp_do_sm run #7: crashed: kernel BUG in corrupted run #8: crashed: kernel BUG in sctp_do_sm run #9: OK revisions tested: 2, total time: 39m30.035470085s (build: 20m4.697095571s, test: 18m33.429395422s) the crash still happens on HEAD commit msg: Linux 4.19.188 crash: kernel BUG in sctp_do_sm IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0_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 ]------------ kernel BUG at net/sctp/sm_sideeffect.c:1538! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 7869 Comm: syz-executor.1 Not tainted 4.19.188-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1538 [inline] RIP: 0010:sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] RIP: 0010:sctp_do_sm+0x3a42/0x5040 net/sctp/sm_sideeffect.c:1170 Code: 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 74 08 3c 03 0f 8e d0 12 00 00 f6 83 b0 02 00 00 40 0f 85 7e e5 ff ff e9 a8 e5 ff ff <0f> 0b 49 8d 7d 12 48 89 fa 48 89 f9 48 c1 ea 03 83 e1 07 42 0f b6 RSP: 0018:ffff8881f3107958 EFLAGS: 00010246 RAX: ffff8881d21086b0 RBX: ffff8881d21082c0 RCX: ffff8881d21088f0 RDX: 1ffff1103a4210b3 RSI: 0000000000000012 RDI: ffff8881d2108598 RBP: ffff8881f3107c10 R08: ffff8881f3107b38 R09: ffff8881d4f8e268 R10: ffffed103d964148 R11: ffff8881ecb20a47 R12: 0000000000000000 R13: ffff8881f3107b78 R14: dffffc0000000000 R15: ffff8881f3107be8 FS: 000000000287e400(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9d9787afc0 CR3: 00000001d31f0005 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: sctp_primitive_SHUTDOWN+0x7c/0xc0 net/sctp/primitive.c:104 sctp_close+0x354/0x750 net/sctp/socket.c:1560 inet_release+0xb4/0x1b0 net/ipv4/af_inet.c:427 inet6_release+0x46/0x60 net/ipv6/af_inet6.c:472 __sock_release+0xc2/0x290 net/socket.c:579 sock_close+0x10/0x20 net/socket.c:1140 __fput+0x249/0x7f0 fs/file_table.c:278 ____fput+0x9/0x10 fs/file_table.c:309 task_work_run+0x108/0x180 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x1a9/0x200 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x413/0x4e0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x41741b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffcd4f66e80 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 000000000041741b RDX: 0000000000000000 RSI: 0000000000541030 RDI: 0000000000000004 RBP: 0000000000000005 R08: 0000000000000000 R09: 0000001b32b200e0 R10: 00007ffcd4f66f50 R11: 0000000000000293 R12: 00000000000003e8 R13: 000000000053bf00 R14: 000000000053bf0c R15: 000000000053bf00 Modules linked in: ---[ end trace 024831ba3de2a342 ]--- RIP: 0010:sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1538 [inline] RIP: 0010:sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] RIP: 0010:sctp_do_sm+0x3a42/0x5040 net/sctp/sm_sideeffect.c:1170 Code: 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 74 08 3c 03 0f 8e d0 12 00 00 f6 83 b0 02 00 00 40 0f 85 7e e5 ff ff e9 a8 e5 ff ff <0f> 0b 49 8d 7d 12 48 89 fa 48 89 f9 48 c1 ea 03 83 e1 07 42 0f b6 RSP: 0018:ffff8881f3107958 EFLAGS: 00010246 RAX: ffff8881d21086b0 RBX: ffff8881d21082c0 RCX: ffff8881d21088f0 RDX: 1ffff1103a4210b3 RSI: 0000000000000012 RDI: ffff8881d2108598 RBP: ffff8881f3107c10 R08: ffff8881f3107b38 R09: ffff8881d4f8e268 R10: ffffed103d964148 R11: ffff8881ecb20a47 R12: 0000000000000000 R13: ffff8881f3107b78 R14: dffffc0000000000 R15: ffff8881f3107be8 FS: 000000000287e400(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005647b5876e28 CR3: 00000001d31f0002 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400