bisecting cause commit starting from 11ba468877bb23f28956a35e896356252d63c983 building syzkaller on f90ec89960664f503e0811d8b67c56bb1128d47d testing commit 11ba468877bb23f28956a35e896356252d63c983 with gcc (GCC) 8.1.0 kernel signature: d7a62394e8a62aca66ffe729f97a84088d5cb90900dfbed9c123c277cba5d335 run #0: crashed: possible deadlock in shmem_fallocate run #1: crashed: possible deadlock in shmem_fallocate run #2: crashed: possible deadlock in shmem_fallocate run #3: crashed: possible deadlock in shmem_fallocate run #4: crashed: possible deadlock in shmem_fallocate run #5: crashed: possible deadlock in shmem_fallocate run #6: crashed: possible deadlock in shmem_fallocate run #7: OK run #8: OK run #9: OK testing release v5.7 testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 with gcc (GCC) 8.1.0 kernel signature: 3e2502d9b44e72041cdab3790e72a09968bce7faa2bcf71d3e1f22c617dd5c76 run #0: crashed: possible deadlock in shmem_fallocate run #1: crashed: possible deadlock in shmem_fallocate run #2: crashed: possible deadlock in shmem_fallocate run #3: crashed: possible deadlock in shmem_fallocate run #4: crashed: possible deadlock in shmem_fallocate run #5: crashed: possible deadlock in shmem_fallocate run #6: crashed: possible deadlock in shmem_fallocate run #7: OK run #8: OK run #9: OK testing release v5.6 testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0 kernel signature: 6c4e481b31d162b76bffed650015d2ca65bf421084fb5239704ccc7b960daaa4 run #0: crashed: possible deadlock in shmem_fallocate run #1: crashed: possible deadlock in shmem_fallocate run #2: crashed: possible deadlock in shmem_fallocate run #3: crashed: possible deadlock in shmem_fallocate run #4: crashed: possible deadlock in shmem_fallocate run #5: crashed: possible deadlock in shmem_fallocate run #6: crashed: possible deadlock in shmem_fallocate run #7: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/syzkaller/jobs/linux/workdir/image/key" "/tmp/syz-executor097253931" "root@10.128.15.203:./syz-executor097253931"]: exit status 1 Connection timed out during banner exchange lost connection run #8: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/syzkaller/jobs/linux/workdir/image/key" "/tmp/syz-executor282893205" "root@10.128.0.174:./syz-executor282893205"]: exit status 1 Connection timed out during banner exchange lost connection run #9: crashed: BUG: MAX_LOCKDEP_ENTRIES too low! testing release v5.5 testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0 kernel signature: 556a4c47db0e93d6cb64526ac6eddf1ae267207247b651c0555e9a1135498d98 run #0: crashed: possible deadlock in shmem_fallocate run #1: crashed: possible deadlock in shmem_fallocate run #2: crashed: possible deadlock in shmem_fallocate run #3: crashed: possible deadlock in shmem_fallocate run #4: crashed: possible deadlock in shmem_fallocate run #5: crashed: possible deadlock in shmem_fallocate run #6: crashed: possible deadlock in shmem_fallocate run #7: crashed: possible deadlock in shmem_fallocate run #8: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/syzkaller/jobs/linux/workdir/image/key" "/tmp/syz-executor281113743" "root@10.128.15.206:./syz-executor281113743"]: exit status 1 Connection timed out during banner exchange lost connection run #9: crashed: possible deadlock in shmem_fallocate testing release v5.4 testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0 kernel signature: 1c3f9c35a44a4b209f063b3fcb8df3171b5486ed663d61ab7638a2721a25e560 run #0: crashed: possible deadlock in shmem_fallocate run #1: crashed: possible deadlock in shmem_fallocate run #2: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/syzkaller/jobs/linux/workdir/image/key" "/tmp/syz-executor126997130" "root@10.128.0.5:./syz-executor126997130"]: exit status 1 Connection timed out during banner exchange lost connection run #3: crashed: possible deadlock in shmem_fallocate run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK testing release v5.3 testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0 kernel signature: 4b29cac0765736fe3529c9f332457502b34b7384076b1254557e53024325c7d2 run #0: OK run #1: crashed: general protection fault in batadv_iv_ogm_queue_add run #2: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/syzkaller/jobs/linux/workdir/image/key" "/tmp/syz-executor485773888" "root@10.128.10.27:./syz-executor485773888"]: exit status 1 Connection reset by 10.128.10.27 port 22 lost connection run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK testing release v5.2 testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0 kernel signature: 7db35c1438fdcfc9ef196541355520ad8f59b3e2af2ab36ba58e1b05e5e5c01a all runs: crashed: possible deadlock in shmem_fallocate testing release v5.1 testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0 kernel signature: b5eb7aa5f75c15f279a54fb19484bc3b738c129d62dec94817128ae07ec99770 all runs: crashed: possible deadlock in shmem_fallocate testing release v5.0 testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0 kernel signature: 32343432f05c49210eecbc962d1e2cce8191555e181b9b11fe08fc7caa0f9cf2 run #0: crashed: possible deadlock in shmem_fallocate run #1: crashed: possible deadlock in shmem_fallocate run #2: crashed: possible deadlock in shmem_fallocate run #3: crashed: possible deadlock in shmem_fallocate run #4: crashed: possible deadlock in shmem_fallocate run #5: crashed: general protection fault in batadv_iv_ogm_queue_add run #6: crashed: possible deadlock in shmem_fallocate run #7: crashed: possible deadlock in shmem_fallocate run #8: crashed: possible deadlock in shmem_fallocate run #9: crashed: possible deadlock in shmem_fallocate testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 kernel signature: f0b34c3b7a7fa9d6121119ae43304e795504486034d8fb949927a1507d78e2dd run #0: crashed: possible deadlock in shmem_fallocate run #1: crashed: possible deadlock in shmem_fallocate run #2: crashed: general protection fault in batadv_iv_ogm_schedule run #3: crashed: possible deadlock in shmem_fallocate run #4: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/syzkaller/jobs/linux/workdir/image/key" "/tmp/syz-executor089811868" "root@10.128.0.149:./syz-executor089811868"]: exit status 1 Connection timed out during banner exchange lost connection run #5: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/syzkaller/jobs/linux/workdir/image/key" "/tmp/syz-executor572080821" "root@10.128.0.81:./syz-executor572080821"]: exit status 1 Connection timed out during banner exchange lost connection run #6: OK run #7: OK run #8: OK run #9: OK testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 kernel signature: 01131b4ac61275923f5ca37b311f65a6852db6beddb41cebb4854d5cc98a656f run #0: crashed: possible deadlock in shmem_fallocate run #1: crashed: possible deadlock in shmem_fallocate run #2: crashed: general protection fault in batadv_iv_ogm_queue_add run #3: crashed: possible deadlock in shmem_fallocate run #4: crashed: possible deadlock in shmem_fallocate run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 kernel signature: de89a36886f05696f9e2cf9d58473eeea95a10a6703d67cf3fc77d6dda04b714 run #0: crashed: possible deadlock in vfs_fallocate run #1: crashed: possible deadlock in vfs_fallocate run #2: crashed: possible deadlock in vfs_fallocate run #3: crashed: possible deadlock in vfs_fallocate run #4: crashed: possible deadlock in vfs_fallocate run #5: crashed: possible deadlock in vfs_fallocate run #6: crashed: possible deadlock in vfs_fallocate run #7: OK run #8: OK run #9: OK testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0 kernel signature: 4b96e68e1468f35b68d9deee9252b802f0f683e8f6e4648f673747d8a3da1e48 run #0: crashed: possible deadlock in vfs_fallocate run #1: crashed: possible deadlock in vfs_fallocate run #2: crashed: possible deadlock in vfs_fallocate run #3: crashed: possible deadlock in vfs_fallocate run #4: crashed: possible deadlock in vfs_fallocate run #5: crashed: possible deadlock in vfs_fallocate run #6: OK run #7: OK run #8: OK run #9: crashed: possible deadlock in vfs_fallocate testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0 kernel signature: c966205c09c94a97978092237a91bf5ccd52cf234f4b7d7c7b7074e292f0703f run #0: crashed: possible deadlock in vfs_fallocate run #1: crashed: possible deadlock in vfs_fallocate run #2: crashed: possible deadlock in vfs_fallocate run #3: crashed: possible deadlock in vfs_fallocate run #4: crashed: possible deadlock in vfs_fallocate run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0 kernel signature: 9c29b949b2da39ce1a124f92a5352d857462f5150b67858aa62342a26982dff1 run #0: crashed: possible deadlock in vfs_fallocate run #1: crashed: possible deadlock in vfs_fallocate run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0 kernel signature: 22a9d201acea22c4a3c9e02b2c347d7f69ec7991b6bfae7fdb5c59b59001516b run #0: crashed: possible deadlock in vfs_fallocate run #1: crashed: possible deadlock in vfs_fallocate run #2: crashed: possible deadlock in vfs_fallocate run #3: OK run #4: OK run #5: crashed: possible deadlock in vfs_fallocate run #6: OK run #7: OK run #8: OK run #9: OK testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0 kernel signature: 12b654c09dd9c5d9a15561d39c85333ad0e712f4a8f4f2948f16de45877ef558 failed: failed to create VM pool: failed to delete GCE image: failed to delete image: googleapi: Error 400: The image resource 'projects/syzkaller/global/images/ci-upstream-kasan-gce-bisect-job-bisect-job' is already being used by 'projects/drydock-vm-scanning-prod/zones/us-west1-b/disks/disk-c9f70cb72b0988dfc4d9aced3d69745e52873b6d8cdfbb76a47', resourceInUseByAnotherResource testing release v4.12 testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0 kernel signature: 14d10083eca04fa0298d8cf623fe243ffe57f43fb221ab9c5813cd558f14deb8 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: 65142d69ed5557030183dc2271c59dadd067313231d8e607f9aa3328352ef66e 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: e16a034e216cf5f75cf8c21bfc26e3a2663ebab4d25187432615c9960db46ed0 all runs: crashed: INFO: suspicious RCU usage in pids_can_fork testing release v4.9 testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0 kernel signature: b8b2ced050fb9bcfddf5ca3933b150f338b01e9bcb4a09e0a178250023bc8e65 all runs: crashed: INFO: suspicious RCU usage in pids_can_fork testing release v4.8 testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0 kernel signature: 80b1578f0401dcee3d956ea5512c8c7109424e24e3d48a2a3ac7b02a453d83c9 all runs: crashed: INFO: suspicious RCU usage in pids_can_fork testing release v4.7 testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0 kernel signature: 6b176f1baca50886abbf77240207afd76d9bbd315c8adbc3a9333d377cf65318 run #0: crashed: possible deadlock in __sb_start_write run #1: crashed: possible deadlock in __sb_start_write run #2: crashed: general protection fault in batadv_purge_outstanding_packets run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK testing release v4.6 testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0 kernel signature: 459d45e3b7d590f203061dc290f392237fa31675df9ca0335a5db378178138ed all runs: crashed: WARNING in sysfs_warn_dup revisions tested: 24, total time: 5h40m15.163312301s (build: 2h15m59.73579243s, test: 3h18m53.497265309s) the crash already happened on the oldest tested release commit msg: Linux 4.6 crash: WARNING in sysfs_warn_dup IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready bridge0: port 1(bridge_slave_0) entered blocking state bridge0: port 1(bridge_slave_0) entered disabled state device bridge_slave_0 entered promiscuous mode ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5892 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: 5892 Comm: syz-executor.0 Not tainted 4.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 ffff8800b39e6fc8 ffffffff82c65e52 ffffffff85c81040 ffff8800b39e70a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009 ffff8800b39e7090 ffffffff8160d884 0000000041b58ab3 ffffffff868f3402 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