bisecting cause commit starting from e8878ab825450c9ac07a0fc22e1f66fdb62b4f72 building syzkaller on 79fb24e23d3bc27ad2cbb1595e76860ef9743d86 testing commit e8878ab825450c9ac07a0fc22e1f66fdb62b4f72 with gcc (GCC) 8.1.0 kernel signature: d0eb55ebd196875814487acee41b90c244b7f95e525be7a3118c93c45fe764fa all runs: crashed: no output from test machine testing release v5.8 testing commit bcf876870b95592b52519ed4aafcf9d95999bc9c with gcc (GCC) 8.1.0 kernel signature: 9635a353a463d6dff1110746014e60e7ff4c09822ce5c1c3469cf36a78965c86 run #0: crashed: BUG: unable to handle kernel paging request in in_gate_area_no_mm run #1: crashed: BUG: sleeping function called from invalid context in exc_page_fault run #2: crashed: BUG: sleeping function called from invalid context in exc_page_fault run #3: crashed: BUG: sleeping function called from invalid context in exc_page_fault run #4: crashed: BUG: unable to handle kernel paging request in in_gate_area_no_mm run #5: crashed: no output from test machine run #6: crashed: no output from test machine run #7: crashed: no output from test machine run #8: crashed: no output from test machine run #9: crashed: no output from test machine testing release v5.7 testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 with gcc (GCC) 8.1.0 kernel signature: 15a78f7bb8f568dee85ed4e8912a7256744c0773728035162cb84a1bd0d803b2 run #0: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #1: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #2: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #3: crashed: invalid opcode in do_syscall_64 run #4: crashed: general protection fault in pvclock_gtod_notify run #5: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #6: crashed: invalid opcode in do_syscall_64 run #7: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #8: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #9: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 testing release v5.6 testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0 kernel signature: 75f80546009cc6e96cc8feb31c1a1f2c252b6d0677f4fbcb4f6301274367e533 run #0: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #1: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #2: crashed: general protection fault in pvclock_gtod_notify run #3: crashed: BUG: unable to handle kernel NULL pointer dereference in syscall_trace_enter run #4: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #5: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #6: crashed: BUG: unable to handle kernel paging request in do_syscall_64 run #7: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #8: crashed: invalid opcode in do_syscall_64 run #9: crashed: no output from test machine testing release v5.5 testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0 kernel signature: 8ffa761ee1c63808b10db0ac73ccad4beeec486e8b49406335a13c2e401c0355 run #0: crashed: invalid opcode in do_syscall_64 run #1: crashed: invalid opcode in do_syscall_64 run #2: crashed: BUG: sleeping function called from invalid context in __do_page_fault run #3: crashed: BUG: sleeping function called from invalid context in __do_page_fault run #4: crashed: BUG: unable to handle kernel paging request in do_syscall_64 run #5: crashed: BUG: sleeping function called from invalid context in __do_page_fault run #6: crashed: BUG: sleeping function called from invalid context in __do_page_fault run #7: crashed: BUG: sleeping function called from invalid context in __do_page_fault run #8: crashed: BUG: sleeping function called from invalid context in __do_page_fault run #9: crashed: invalid opcode in do_syscall_64 testing release v5.4 testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0 kernel signature: 19a8b99a16ed3800239bfc5be548eb44364b4e0d1067c84f7f6ccb41ccea2926 run #0: crashed: BUG: unable to handle kernel NULL pointer dereference in syscall_trace_enter run #1: crashed: BUG: unable to handle kernel NULL pointer dereference in syscall_trace_enter run #2: crashed: BUG: unable to handle kernel paging request in syscall_return_slowpath run #3: crashed: general protection fault in exit_to_usermode_loop run #4: crashed: unexpected kernel reboot run #5: crashed: no output from test machine run #6: crashed: no output from test machine run #7: crashed: no output from test machine run #8: crashed: no output from test machine run #9: crashed: no output from test machine testing release v5.3 testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0 kernel signature: be665e1605d914daf455ef945c8909d8ce6fd86b8f9e2cc16961fdda2dcc4911 run #0: crashed: unexpected kernel reboot run #1: crashed: unexpected kernel reboot run #2: crashed: unexpected kernel reboot run #3: crashed: unexpected kernel reboot run #4: crashed: unexpected kernel reboot run #5: crashed: unexpected kernel reboot run #6: crashed: no output from test machine run #7: crashed: no output from test machine run #8: crashed: no output from test machine run #9: crashed: no output from test machine testing release v5.2 testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0 kernel signature: 1b97a91497db5129ea6acaac056cace8d4dd8cbe93a2d908337e32152bc8bdd4 run #0: crashed: general protection fault in do_syscall_64 run #1: crashed: BUG: unable to handle kernel NULL pointer dereference in update_vsyscall run #2: crashed: invalid opcode in do_syscall_64 run #3: crashed: general protection fault in do_syscall_64 run #4: crashed: invalid opcode in do_syscall_64 run #5: crashed: general protection fault in do_syscall_64 run #6: crashed: invalid opcode in do_syscall_64 run #7: crashed: general protection fault in do_syscall_64 run #8: crashed: invalid opcode in do_syscall_64 run #9: crashed: BUG: unable to handle kernel NULL pointer dereference in update_vsyscall testing release v5.1 testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0 kernel signature: 9136102f5e048d5202e0a93f935b938c703b90520139ce766a5eee39edd76fb1 run #0: crashed: general protection fault in do_syscall_64 run #1: crashed: unexpected kernel reboot run #2: crashed: general protection fault in do_syscall_64 run #3: crashed: unexpected kernel reboot run #4: crashed: invalid opcode in do_syscall_64 run #5: crashed: invalid opcode in do_syscall_64 run #6: crashed: invalid opcode in do_syscall_64 run #7: crashed: general protection fault in do_syscall_64 run #8: crashed: general protection fault in do_syscall_64 run #9: crashed: unexpected kernel reboot testing release v5.0 testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0 kernel signature: f08373db5b73fc54f5118a0ee582f3adcd161b3025ae79faea14936025c8b9a2 run #0: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #1: crashed: general protection fault in do_syscall_64 run #2: crashed: general protection fault in do_syscall_64 run #3: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #4: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #5: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #6: crashed: general protection fault in do_syscall_64 run #7: crashed: general protection fault in do_syscall_64 run #8: crashed: general protection fault in do_syscall_64 run #9: crashed: BUG: unable to handle kernel NULL pointer dereference in update_vsyscall testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 kernel signature: 336bf6b82901867c4b37871d758f6ad15084f2bd24845d97c3b19c5a662476a3 run #0: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #1: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #2: crashed: invalid opcode in do_syscall_64 run #3: crashed: general protection fault in do_syscall_64 run #4: crashed: general protection fault in do_syscall_64 run #5: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #6: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #7: crashed: invalid opcode in do_syscall_64 run #8: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #9: crashed: general protection fault in do_syscall_64 testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 kernel signature: 12be379c071f22070f25b18072c85e01e799d55dab5107da57226d5a130657aa run #0: crashed: BUG: unable to handle kernel NULL pointer dereference in corrupted run #1: crashed: general protection fault in trace_hardirqs_on_thunk run #2: crashed: BUG: sleeping function called from invalid context in __do_page_fault run #3: crashed: BUG: sleeping function called from invalid context in corrupted run #4: crashed: BUG: sleeping function called from invalid context in __do_page_fault run #5: crashed: BUG: unable to handle kernel NULL pointer dereference in corrupted run #6: crashed: BUG: sleeping function called from invalid context in __do_page_fault run #7: crashed: BUG: unable to handle kernel NULL pointer dereference in corrupted run #8: crashed: BUG: sleeping function called from invalid context in corrupted run #9: crashed: BUG: sleeping function called from invalid context in __do_page_fault testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 kernel signature: db5a368d900ece23a634383d5283143d18828af971596096f15b1a9346f02c4d run #0: crashed: general protection fault in do_syscall_64 run #1: crashed: general protection fault in do_syscall_64 run #2: crashed: general protection fault in do_syscall_64 run #3: crashed: general protection fault in do_syscall_64 run #4: crashed: general protection fault in do_syscall_64 run #5: crashed: invalid opcode in do_syscall_64 run #6: crashed: general protection fault in do_syscall_64 run #7: crashed: general protection fault in do_syscall_64 run #8: crashed: general protection fault in do_syscall_64 run #9: crashed: general protection fault in do_syscall_64 testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0 kernel signature: b9eeaf4b479e93f5c6934ced0f9fd292e7fe616a53e64062d35dca73ab70bc3a run #0: crashed: BUG: unable to handle kernel paging request in do_syscall_64 run #1: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #2: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #3: crashed: BUG: unable to handle kernel paging request in entry_SYSCALL_64_after_hwframe run #4: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #5: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #6: crashed: unexpected kernel reboot run #7: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 run #8: crashed: BUG: unable to handle kernel paging request in syscall_return_slowpath run #9: crashed: BUG: unable to handle kernel paging request in do_syscall_64 testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0 kernel signature: 310058c9816716e683022a103708f58c2771c1661a43f4fa03826758081ca2be run #0: crashed: BUG: sleeping function called from invalid context in __do_page_fault run #1: crashed: BUG: sleeping function called from invalid context in __do_page_fault run #2: crashed: BUG: sleeping function called from invalid context in __do_page_fault run #3: crashed: BUG: sleeping function called from invalid context in corrupted run #4: crashed: BUG: unable to handle kernel NULL pointer dereference in exit_to_usermode_loop run #5: crashed: BUG: sleeping function called from invalid context in corrupted run #6: crashed: BUG: sleeping function called from invalid context in __do_page_fault run #7: crashed: BUG: unable to handle kernel NULL pointer dereference in exit_to_usermode_loop run #8: crashed: unexpected kernel reboot run #9: crashed: no output from test machine testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0 kernel signature: 062288d7dd41b44f2739f13ed559dd7882419b116513a661e4384e318797115b run #0: crashed: KASAN: out-of-bounds Read in kvm_io_bus_read run #1: crashed: BUG: unable to handle kernel paging request in corrupted run #2: crashed: BUG: unable to handle kernel paging request in corrupted run #3: crashed: WARNING: suspicious RCU usage in do_general_protection run #4: crashed: KASAN: out-of-bounds Read in kvm_io_bus_read run #5: crashed: BUG: unable to handle kernel paging request in retint_kernel run #6: crashed: general protection fault in do_syscall_64 run #7: crashed: BUG: unable to handle kernel paging request in return_from_SYSCALL_64 run #8: crashed: WARNING: suspicious RCU usage in do_general_protection run #9: crashed: invalid opcode in update_vsyscall testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0 kernel signature: ea531644708126a39112da8410224a343268bf0062e460544dba221bd3fc2514 run #0: crashed: BUG: unable to handle kernel NULL pointer dereference in ORMASK run #1: crashed: general protection fault in ORMASK run #2: crashed: BUG: unable to handle kernel paging request in entry_SYSCALL_64_fastpath run #3: crashed: unexpected kernel reboot run #4: crashed: general protection fault in ORMASK run #5: crashed: KASAN: out-of-bounds Read in do_syscall_64 run #6: crashed: BUG: unable to handle kernel paging request in ORMASK run #7: crashed: BUG: unable to handle kernel paging request in corrupted run #8: crashed: unexpected kernel reboot run #9: crashed: BUG: unable to handle kernel paging request in corrupted testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0 kernel signature: 93135c6523861c75c3b4d875ad0f627b593adee51236e425e646ada917a9b0d0 all runs: crashed: unexpected kernel reboot testing release v4.12 testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0 kernel signature: eed79dab26ea8a1deca524ceb09879b072398c0882a4ff4eeb51456f23b704c1 all runs: crashed: BUG: sleeping function called from invalid context in tap_get_minor testing release v4.11 testing commit a351e9b9fc24e982ec2f0e76379a49826036da12 with gcc (GCC) 7.3.0 kernel signature: c5e73cc61495cdbb2e28c5ff24939a464e19d42b0355280a378f42021d039a6b all runs: crashed: BUG: sleeping function called from invalid context in tap_get_minor testing release v4.10 testing commit c470abd4fde40ea6a0846a2beab642a578c0b8cd with gcc (GCC) 5.5.0 kernel signature: 16da9d03e2a053d0c8ebe9bbdf767d684ac7f244f57a690e294f58c296dd8041 run #0: crashed: INFO: suspicious RCU usage in native_safe_halt run #1: crashed: BUG: unable to handle kernel NULL pointer dereference in trace_hardirqs_on_thunk run #2: crashed: BUG: sleeping function called from invalid context in __do_page_fault run #3: crashed: BUG: unable to handle kernel paging request in __die run #4: crashed: BUG: unable to handle kernel NULL pointer dereference in trace_hardirqs_on_thunk run #5: crashed: BUG: unable to handle kernel NULL pointer dereference in trace_hardirqs_on_thunk run #6: crashed: BUG: unable to handle kernel NULL pointer dereference in trace_hardirqs_on_thunk run #7: crashed: BUG: unable to handle kernel NULL pointer dereference in trace_hardirqs_on_thunk run #8: crashed: no output from test machine run #9: crashed: no output from test machine testing release v4.9 testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0 kernel signature: 3778d1369af3c9068f67bba9cbc9fab83cdb97c84ade00b02508a076594766c1 run #0: crashed: BUG: unable to handle kernel NULL pointer dereference in corrupted run #1: crashed: BUG: unable to handle kernel NULL pointer dereference in trace_hardirqs_on_thunk run #2: crashed: BUG: sleeping function called from invalid context in corrupted run #3: crashed: BUG: unable to handle kernel NULL pointer dereference in trace_hardirqs_on_thunk run #4: crashed: BUG: sleeping function called from invalid context in __do_page_fault run #5: crashed: BUG: unable to handle kernel NULL pointer dereference in trace_hardirqs_on_thunk run #6: crashed: BUG: unable to handle kernel NULL pointer dereference in trace_hardirqs_on_thunk run #7: crashed: BUG: unable to handle kernel NULL pointer dereference in trace_hardirqs_on_thunk run #8: crashed: BUG: sleeping function called from invalid context in corrupted run #9: crashed: BUG: sleeping function called from invalid context in __do_page_fault testing release v4.8 testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0 kernel signature: 0ec20fb65cc78fb5a125d86bb3392afd81e3dcdc110432b21b330c5939d6440f run #0: crashed: BUG: sleeping function called from invalid context in __do_page_fault run #1: crashed: BUG: sleeping function called from invalid context in __do_page_fault run #2: crashed: BUG: unable to handle kernel NULL pointer dereference in trace_hardirqs_on_thunk run #3: crashed: BUG: sleeping function called from invalid context in corrupted run #4: crashed: BUG: sleeping function called from invalid context in __do_page_fault run #5: crashed: BUG: unable to handle kernel NULL pointer dereference in trace_hardirqs_on_thunk run #6: crashed: BUG: sleeping function called from invalid context in corrupted run #7: crashed: BUG: sleeping function called from invalid context in corrupted run #8: crashed: BUG: unable to handle kernel NULL pointer dereference in trace_hardirqs_on_thunk run #9: crashed: BUG: unable to handle kernel NULL pointer dereference in trace_hardirqs_on_thunk testing release v4.7 testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0 kernel signature: 92a0c17d3abb967242118a62160ec92beff130e8ce2d033d46c3402ff3da851a run #0: crashed: BUG: sleeping function called from invalid context in __do_page_fault run #1: crashed: BUG: unable to handle kernel paging request in __ipv6_get_lladdr run #2: crashed: BUG: unable to handle kernel paging request in corrupted run #3: crashed: INFO: trying to register non-static key in try_to_wake_up run #4: crashed: BUG: unable to handle kernel NULL pointer dereference in trace_hardirqs_on_thunk run #5: crashed: BUG: unable to handle kernel paging request in drain_array run #6: crashed: general protection fault in mm_update_next_owner run #7: crashed: BUG: unable to handle kernel NULL pointer dereference in trace_hardirqs_on_thunk run #8: crashed: general protection fault in update_vsyscall run #9: crashed: general protection fault in update_vsyscall testing release v4.6 testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0 kernel signature: 25ede78c328bb3627c622b414c97d442dfa6dee66c9480c7135130032746a2ba all runs: crashed: WARNING in sysfs_warn_dup revisions tested: 25, total time: 4h12m10.274749462s (build: 2h19m21.144002708s, test: 1h48m51.455557883s) the crash already happened on the oldest tested release commit msg: Linux 4.6 crash: WARNING in sysfs_warn_dup device bridge_slave_0 entered promiscuous mode bridge0: port 2(bridge_slave_1) entered blocking state bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_1 entered promiscuous mode ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5883 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 fs/sysfs/dir.c:30 sysfs: cannot create duplicate filename '/class/macvtap/tap50' Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 5883 Comm: syz-executor.2 Not tainted 4.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 ffff8800b15b6fc8 ffffffff82c65e52 ffffffff85c81040 ffff8800b15b70a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009 ffff8800b15b7090 ffffffff8160d884 0000000041b58ab3 ffffffff868f8c5a Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0x136/0x1d4 lib/dump_stack.c:51 [] panic+0x1af/0x348 kernel/panic.c:152 [] __warn+0x18d/0x1b0 kernel/panic.c:504 [] warn_slowpath_fmt+0x92/0xb0 kernel/panic.c:527 [] sysfs_warn_dup+0x7b/0xa0 fs/sysfs/dir.c:30 [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 fs/sysfs/symlink.c:51 [] sysfs_do_create_link fs/sysfs/symlink.c:80 [inline] [] sysfs_create_link+0x43/0xb0 fs/sysfs/symlink.c:92 [] device_add_class_symlinks drivers/base/core.c:891 [inline] [] device_add+0x677/0x1350 drivers/base/core.c:1086 [] device_create_groups_vargs+0x1c8/0x220 drivers/base/core.c:1709 [] device_create_vargs drivers/base/core.c:1749 [inline] [] device_create+0x88/0xa0 drivers/base/core.c:1785 [] macvtap_device_event+0x1c4/0x2a0 drivers/net/macvtap.c:1298 [] notifier_call_chain+0x8b/0x170 kernel/notifier.c:93 [] __raw_notifier_call_chain kernel/notifier.c:394 [inline] [] raw_notifier_call_chain+0x11/0x20 kernel/notifier.c:401 [] call_netdevice_notifiers_info+0x47/0x80 net/core/dev.c:1643 [] call_netdevice_notifiers net/core/dev.c:1659 [inline] [] register_netdevice+0x8e8/0xd00 net/core/dev.c:7027 [] macvlan_common_newlink+0x8b9/0x1090 drivers/net/macvlan.c:1316 [] macvtap_newlink+0xbf/0x110 drivers/net/macvtap.c:471 [] rtnl_newlink+0xd4b/0x1230 net/core/rtnetlink.c:2466 [] rtnetlink_rcv_msg+0x222/0x680 net/core/rtnetlink.c:3513 [] netlink_rcv_skb+0x242/0x350 net/netlink/af_netlink.c:2277 [] rtnetlink_rcv+0x25/0x30 net/core/rtnetlink.c:3519 [] netlink_unicast_kernel net/netlink/af_netlink.c:1214 [inline] [] netlink_unicast+0x3da/0x560 net/netlink/af_netlink.c:1240 [] netlink_sendmsg+0x9bb/0xb40 net/netlink/af_netlink.c:1786 [] sock_sendmsg_nosec net/socket.c:612 [inline] [] sock_sendmsg+0xb5/0xf0 net/socket.c:622 [] SYSC_sendto net/socket.c:1648 [inline] [] SyS_sendto+0x1ca/0x290 net/socket.c:1616 [] entry_SYSCALL_64_fastpath+0x23/0xc1 Kernel Offset: disabled