bisecting cause commit starting from ac935d22736659be734251247dcc6f444fb98972
building syzkaller on 5457883a514281287bbd81364c4e26e25828563d
testing commit ac935d22736659be734251247dcc6f444fb98972 with gcc (GCC) 8.1.0
kernel signature: 87c96a449a79743749b8546f65352ca49d8f57a660f7ae5cc8a66093c73ef039
run #0: crashed: KASAN: use-after-free Write in get_block
run #1: crashed: KASAN: out-of-bounds Write in get_block
run #2: crashed: KASAN: use-after-free Write in get_block
run #3: crashed: KASAN: use-after-free Write in get_block
run #4: crashed: KASAN: use-after-free Write in get_block
run #5: crashed: KASAN: use-after-free Write in get_block
run #6: crashed: KASAN: use-after-free Write in get_block
run #7: crashed: KASAN: use-after-free Write in get_block
run #8: crashed: KASAN: use-after-free Write in get_block
run #9: crashed: KASAN: use-after-free Write in get_block
testing release v5.6
testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0
kernel signature: f50c13a852a70c9967dd7f803d8948a78bdab7cdf01c015968f2d5136a037c2b
all runs: crashed: KASAN: use-after-free Write in get_block
testing release v5.5
testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0
kernel signature: a69ff6f4a958d779b57b09f88d48134acb03982134ad45def5ea6b42b705d323
all runs: crashed: KASAN: use-after-free Write in get_block
testing release v5.4
testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0
kernel signature: 4f64b52ca4da4a59ef65370939e15d0db69884366d70613bf218b2718244cd24
all runs: crashed: KASAN: use-after-free Write in get_block
testing release v5.3
testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0
kernel signature: b142fdafdedf5d4265273eae8ca3599eddea5874b572f316fcda37950bfc1fe1
all runs: crashed: KASAN: use-after-free Write in get_block
testing release v5.2
testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0
kernel signature: c7c228c18d1c67b251d68215b9f1464464ed6107dedeaf6d4454416105a117ba
all runs: crashed: KASAN: use-after-free Write in get_block
testing release v5.1
testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0
kernel signature: aa82264c5dc7a2bb1f03c895e8c650a76f05e52e018f331f78b343bcc5d7aac4
all runs: crashed: KASAN: use-after-free Write in get_block
testing release v5.0
testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0
kernel signature: 66b21b2e93d27d1a5706761b47496af99e1f7d06ee470e1fc86d2e08e2f17862
all runs: crashed: KASAN: use-after-free Write in get_block
testing release v4.20
testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0
kernel signature: 1d7d1b9acc8dfc26997c14b81acf065395ae4854b97eb98f340227aab7a2d2e3
run #0: crashed: KASAN: use-after-free Write in get_block
run #1: crashed: KASAN: use-after-free Write in get_block
run #2: crashed: KASAN: use-after-free Write in get_block
run #3: crashed: KASAN: use-after-free Write in get_block
run #4: crashed: KASAN: use-after-free Write in get_block
run #5: crashed: KASAN: out-of-bounds Write in get_block
run #6: crashed: KASAN: out-of-bounds Write in get_block
run #7: crashed: KASAN: use-after-free Write in get_block
run #8: crashed: KASAN: use-after-free Write in get_block
run #9: crashed: KASAN: use-after-free Write in get_block
testing release v4.19
testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0
kernel signature: 3c73d164274eccc4004d091525e7a440a8a9a97034a4dace5b7ac79bec7635bd
run #0: crashed: KASAN: use-after-free Write in get_block
run #1: crashed: KASAN: use-after-free Write in get_block
run #2: crashed: KASAN: use-after-free Write in get_block
run #3: crashed: KASAN: use-after-free Write in get_block
run #4: crashed: KASAN: use-after-free Write in get_block
run #5: crashed: KASAN: use-after-free Write in get_block
run #6: crashed: KASAN: out-of-bounds Write in get_block
run #7: crashed: KASAN: use-after-free Write in get_block
run #8: crashed: KASAN: use-after-free Write in get_block
run #9: crashed: KASAN: use-after-free Write in get_block
testing release v4.18
testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0
kernel signature: 20dced733784118d5aeeb6f334ba5a731d4a92388673c535b57560cccdf39eb9
run #0: crashed: KASAN: use-after-free Write in get_block
run #1: crashed: KASAN: use-after-free Write in get_block
run #2: crashed: KASAN: use-after-free Write in get_block
run #3: crashed: KASAN: use-after-free Write in get_block
run #4: crashed: KASAN: out-of-bounds Write in get_block
run #5: crashed: KASAN: use-after-free Write in get_block
run #6: crashed: KASAN: use-after-free Write in get_block
run #7: crashed: KASAN: use-after-free Write in get_block
run #8: crashed: KASAN: use-after-free Write in get_block
run #9: crashed: KASAN: out-of-bounds Write in get_block
testing release v4.17
testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0
kernel signature: 3e5f68564f59b7e362137a8b024d4224fcbea5cdc201367ffe1e92fdf7cad249
all runs: crashed: KASAN: use-after-free Write in get_block
testing release v4.16
testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0
kernel signature: d300f915ae6759607f4edca691224a01e701205ccd03935da1b63b5e7a9dc861
all runs: crashed: KASAN: use-after-free Write in get_block
testing release v4.15
testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0
kernel signature: 4ec72b99e19c1fbdb75ef079b441a089bf26ff4db0e19950dee4f30a037f12e8
all runs: crashed: KASAN: use-after-free Write in get_block
testing release v4.14
testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0
kernel signature: 76f11db934fad3f5fec5aa95e484a0f2633ef86d799489e05a49c1f05a961512
all runs: crashed: KASAN: use-after-free Write in get_block
testing release v4.13
testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0
kernel signature: ee6a79c9488bf8eaa1dcc50fe6a09e1c554a104f16f78e7f638bca61d4ec12ff
all runs: crashed: KASAN: use-after-free Write in get_block
testing release v4.12
testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0
kernel signature: 635a32b15f54849e8db4a147e6798e74d128f7d4451df5aeec7ec32f6767cca9
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: 4a99d83078259e04d4ac38139e7e158eb12d224140ce38fc040944eb30c515d6
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: 15f8d80268cd824ed733688a696f20af48dbc61a3be37f7ce0923b7a5a35e75a
run #0: crashed: KASAN: use-after-free Write in alloc_branch
run #1: crashed: KASAN: use-after-free Write in alloc_branch
run #2: crashed: KASAN: use-after-free Write in alloc_branch
run #3: crashed: KASAN: use-after-free Write in alloc_branch
run #4: crashed: KASAN: use-after-free Write in alloc_branch
run #5: crashed: KASAN: use-after-free Write in alloc_branch
run #6: crashed: KASAN: use-after-free Write in alloc_branch
run #7: crashed: KASAN: slab-out-of-bounds Write in alloc_branch
run #8: crashed: KASAN: use-after-free Write in alloc_branch
run #9: crashed: KASAN: use-after-free Write in alloc_branch
testing release v4.9
testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0
kernel signature: 381bdaa8203e2133ced24f07a1d5726df623075e51531751a1af2f181a69411d
all runs: crashed: KASAN: use-after-free Write in alloc_branch
testing release v4.8
testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0
kernel signature: 5ce6969a483eb84be6f79681c205a44ff63ab26206a728d039fa089008c9528c
all runs: crashed: KASAN: use-after-free Write in alloc_branch
testing release v4.7
testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0
kernel signature: 4b6166ebec99807c57f46847f90e44eda3f2916f5538f89d6a7c5d88dd72ba6f
all runs: crashed: KASAN: use-after-free Write in alloc_branch
testing release v4.6
testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0
kernel signature: cb7107588a5d14c5610ecb2b662a5c5e951532711d11d809b3eae6f0e3560ea4
all runs: crashed: WARNING in sysfs_warn_dup
revisions tested: 23, total time: 3h20m38.291958144s (build: 2h3m59.590305062s, test: 1h13m31.143312587s)
the crash already happened on the oldest tested release
commit msg: Linux 4.6
crash: WARNING in sysfs_warn_dup
IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready
IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
bond0: Enslaving bond_slave_0 as an active interface with an up link
bond0: Enslaving bond_slave_1 as an active interface with an up link
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5939 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: 0 PID: 5939 Comm: syz-executor.4 Not tainted 4.6.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 ffff8800b2366fc8 ffffffff82c65932 ffffffff85e81040
 ffff8800b23670a0 ffffffff85f2bdc0 ffffffff8191b86b 0000000000000009
 ffff8800b2367090 ffffffff8160d374 0000000041b58ab3 ffffffff86b12d72
Call Trace:
 [<ffffffff82c65932>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff82c65932>] dump_stack+0x136/0x1d4 lib/dump_stack.c:51
 [<ffffffff8160d374>] panic+0x1af/0x348 kernel/panic.c:152
 [<ffffffff81335ecd>] __warn+0x18d/0x1b0 kernel/panic.c:504
 [<ffffffff81335f82>] warn_slowpath_fmt+0x92/0xb0 kernel/panic.c:527
 [<ffffffff8191b86b>] sysfs_warn_dup+0x7b/0xa0 fs/sysfs/dir.c:30
 [<ffffffff8191c0e1>] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 fs/sysfs/symlink.c:51
 [<ffffffff8191c143>] sysfs_do_create_link fs/sysfs/symlink.c:80 [inline]
 [<ffffffff8191c143>] sysfs_create_link+0x43/0xb0 fs/sysfs/symlink.c:92
 [<ffffffff83530157>] device_add_class_symlinks drivers/base/core.c:891 [inline]
 [<ffffffff83530157>] device_add+0x677/0x1350 drivers/base/core.c:1086
 [<ffffffff83531198>] device_create_groups_vargs+0x1c8/0x220 drivers/base/core.c:1709
 [<ffffffff83531298>] device_create_vargs drivers/base/core.c:1749 [inline]
 [<ffffffff83531298>] device_create+0x88/0xa0 drivers/base/core.c:1785
 [<ffffffff838d0584>] macvtap_device_event+0x1c4/0x2a0 drivers/net/macvtap.c:1298
 [<ffffffff81399feb>] notifier_call_chain+0x8b/0x170 kernel/notifier.c:93
 [<ffffffff8139a0f1>] __raw_notifier_call_chain kernel/notifier.c:394 [inline]
 [<ffffffff8139a0f1>] raw_notifier_call_chain+0x11/0x20 kernel/notifier.c:401
 [<ffffffff8499bd57>] call_netdevice_notifiers_info+0x47/0x80 net/core/dev.c:1643
 [<ffffffff849c07a8>] call_netdevice_notifiers net/core/dev.c:1659 [inline]
 [<ffffffff849c07a8>] register_netdevice+0x8e8/0xd00 net/core/dev.c:7027
 [<ffffffff838c7cd9>] macvlan_common_newlink+0x8b9/0x1090 drivers/net/macvlan.c:1316
 [<ffffffff838ce94f>] macvtap_newlink+0xbf/0x110 drivers/net/macvtap.c:471
 [<ffffffff849f125b>] rtnl_newlink+0xd4b/0x1230 net/core/rtnetlink.c:2466
 [<ffffffff849ebd02>] rtnetlink_rcv_msg+0x222/0x680 net/core/rtnetlink.c:3513
 [<ffffffff84b6f322>] netlink_rcv_skb+0x242/0x350 net/netlink/af_netlink.c:2277
 [<ffffffff849ebad5>] rtnetlink_rcv+0x25/0x30 net/core/rtnetlink.c:3519
 [<ffffffff84b6deba>] netlink_unicast_kernel net/netlink/af_netlink.c:1214 [inline]
 [<ffffffff84b6deba>] netlink_unicast+0x3da/0x560 net/netlink/af_netlink.c:1240
 [<ffffffff84b6eaeb>] netlink_sendmsg+0x9bb/0xb40 net/netlink/af_netlink.c:1786
 [<ffffffff8494afe5>] sock_sendmsg_nosec net/socket.c:612 [inline]
 [<ffffffff8494afe5>] sock_sendmsg+0xb5/0xf0 net/socket.c:622
 [<ffffffff8494edda>] SYSC_sendto net/socket.c:1648 [inline]
 [<ffffffff8494edda>] SyS_sendto+0x1ca/0x290 net/socket.c:1616
 [<ffffffff85bebe00>] entry_SYSCALL_64_fastpath+0x23/0xc1
Kernel Offset: disabled